For the tariff on LEVEL 4 if a household used an amount of water that is above 20 kℓ up to 35 kℓ (Step 4).

The question asks for the tariff on LEVEL 4 if a household used an amount of water that is above 20 kℓ up to 35 kℓ (Step 4).
Looking at the table:

• Go to the "STEP" column and find "4".
• The "VOLUME/AMOUNT OF WATER USED" for Step 4 is "above 20 kℓ up to 35 kℓ".
• Go to the "LEVEL 4 R/kℓ" column for Step 4. The tariff is R43,69.

The tariff on Level 4 for Step 4 is $\boxed{\text{R}43.69/\text{k}\ell}$.

The question asks in which STEP/INTERVAL you will pay R52,44 on Level 6.
Looking at the table:

• Go to the "LEVEL 6 R/kℓ" column.
• Find the value R52,44.
• This value corresponds to "STEP 2".

You will pay R52,44 on Level 6 in $\boxed{\text{STEP 2}}$.

The question asks to calculate the VAT exclusive tariff of STEP 1 of Level 6.

• From the table, the tariff for STEP 1 of Level 6 is R29,93/kℓ.
• The table states that the rates are "INCLUDING VAT - 15%".
• To find the VAT exclusive tariff, divide the VAT inclusive tariff by $(1 + \text{VAT rate})$. $$\text{VAT exclusive tariff} = \frac{\text{R}29.93}{1 + 0.15} = \frac{\text{R}29.93}{1.15} = \text{R}26.02608...$$ Rounding to two decimal places: R26.03.

The VAT exclusive tariff of STEP 1 of Level 6 is $\boxed{\text{R}26.03/\text{k}\ell}$.

The question asks to calculate the amount a household will have to pay on Level 4 for consuming 15 kℓ.
We need to calculate the cost for each step up to 15 kℓ on Level 4.

• Step 1: 0 kℓ to 6 kℓ. Volume used: 6 kℓ. Tariff: R4,65/kℓ. Cost for Step 1 = $6 \text{ k}\ell \times \text{R}4.65/\text{k}\ell = \text{R}27.90$
• Step 2: above 6 kℓ to 10 kℓ. Volume used: $10 - 6 = 4$ kℓ. Tariff: R17,75/kℓ. Cost for Step 2 = $4 \text{ k}\ell \times \text{R}17.75/\text{k}\ell = \text{R}71.00$
• Step 3: above 10 kℓ up to 20 kℓ. Remaining volume needed: $15 - 10 = 5$ kℓ. Tariff: R25,97/kℓ. Cost for Step 3 = $5 \text{ k}\ell \times \text{R}25.97/\text{k}\ell = \text{R}129.85$

Total cost for 15 kℓ on Level 4 = Cost Step 1 + Cost Step 2 + Cost Step 3
Total cost = $\text{R}27.90 + \text{R}71.00 + \text{R}129.85 = \text{R}228.75$

The household will have to pay $\boxed{\text{R}228.75}$ on Level 4 for consuming 15 kℓ.

The question asks to calculate the amount a household will have to pay on Level 6 for consuming 23 kℓ.
We need to calculate the cost for each step up to 23 kℓ on Level 6.

• Step 1: 0 kℓ to 6 kℓ. Volume used: 6 kℓ. Tariff: R29,93/kℓ. Cost for Step 1 = $6 \text{ k}\ell \times \text{R}29.93/\text{k}\ell = \text{R}179.58$
• Step 2: above 6 kℓ to 10 kℓ. Volume used: $10 - 6 = 4$ kℓ. Tariff: R52,44/kℓ. Cost for Step 2 = $4 \text{ k}\ell \times \text{R}52.44/\text{k}\ell = \text{R}209.76$
• Step 3: above 10 kℓ up to 20 kℓ. Volume used: $20 - 10 = 10$ kℓ. Tariff: R114,00/kℓ. Cost for Step 3 = $10 \text{ k}\ell \times \text{R}114.00/\text{k}\ell = \text{R}1140.00$
• Step 4: above 20 kℓ up to 35 kℓ. Remaining volume needed: $23 - 20 = 3$ kℓ. Tariff: R134,00/kℓ. Cost for Step 4 = $3 \text{ k}\ell \times \text{R}134.00/\text{k}\ell = \text{R}402.00$

Total cost for 23 kℓ on Level 6 = Cost Step 1 + Cost Step 2 + Cost Step 3 + Cost Step 4
Total cost = $\text{R}179.58 + \text{R}209.76 + \text{R}1140.00 + \text{R}402.00 = \text{R}1931.34$

The household will have to pay $\boxed{\text{R}1931.34}$ on Level 6 for consuming 23 kℓ.

The question asks to calculate how much more a household will pay on Level 6 compared to Level 4 for consuming 37 kℓ.
First, calculate the cost for 37 kℓ on Level 4 and Level 6.

• Cost for 37 kℓ on Level 4:

  • Step 1 (0-6 kℓ): $6 \text{ k}\ell \times \text{R}4.65/\text{k}\ell = \text{R}27.90$
  • Step 2 (6-10 kℓ): $4 \text{ k}\ell \times \text{R}17.75/\text{k}\ell = \text{R}71.00$
  • Step 3 (10-20 kℓ): $10 \text{ k}\ell \times \text{R}25.97/\text{k}\ell = \text{R}259.70$
  • Step 4 (20-35 kℓ): $15 \text{ k}\ell \times \text{R}43.69/\text{k}\ell = \text{R}655.35$
  • Step 5 (35-50 kℓ): Remaining volume: $37 - 35 = 2$ kℓ. Tariff: R113,99/kℓ. Cost for Step 5 = $2 \text{ k}\ell \times \text{R}113.99/\text{k}\ell = \text{R}227.98$ Total cost Level 4 = $\text{R}27.90 + \text{R}71.00 + \text{R}259.70 + \text{R}655.35 + \text{R}227.98 = \text{R}1241.93$

• Cost for 37 kℓ on Level 6:

  • Step 1 (0-6 kℓ): $6 \text{ k}\ell \times \text{R}29.93/\text{k}\ell = \text{R}179.58$
  • Step 2 (6-10 kℓ): $4 \text{ k}\ell \times \text{R}52.44/\text{k}\ell = \text{R}209.76$
  • Step 3 (10-20 kℓ): $10 \text{ k}\ell \times \text{R}114.00/\text{k}\ell = \text{R}1140.00$
  • Step 4 (20-35 kℓ): $15 \text{ k}\ell \times \text{R}134.00/\text{k}\ell = \text{R}2010.00$
  • Step 5 (35-50 kℓ): Remaining volume: $37 - 35 = 2$ kℓ. Tariff: R912,00/kℓ. Cost for Step 5 = $2 \text{ k}\ell \times \text{R}912.00/\text{k}\ell = \text{R}1824.00$ Total cost Level 6 = $\text{R}179.58 + \text{R}209.76 + \text{R}1140.00 + \text{R}2010.00 + \text{R}1824.00 = \text{R}5363.34$

• Difference in cost: Difference = Total cost Level 6 - Total cost Level 4 Difference = $\text{R}5363.34 - \text{R}1241.93 = \text{R}4121.41$

A household will pay $\boxed{\text{R}4121.41}$ more on Level 6 compared to Level 4 for consuming 37 kℓ.