Explain the term tariff (2.1)

A tariff is a pricing structure or rate plan for a service, such as mobile phone calls, electricity, or water, detailing how charges are calculated based on usage.

An advantage of Tariff Option A (Contract) is that it offers predictable monthly costs if Lelo stays within the included 300 minutes, making budgeting easier.

Lelo uses 250 minutes of calls.

• For Tariff Option A (Contract):

  • Fixed monthly fee: R220
  • Includes 300 minutes. Since 250 minutes is less than 300 minutes, there are no extra call costs.
  • Total cost for Option A = R220

• For Tariff Option B (Pay-As-You-Go):

  • No monthly fee.
  • Call cost: R2.30 per minute.
  • Total cost for Option B = $250 \text{ minutes} \times \text{R}2.30/\text{minute}$
  $$\text{Total Cost for Option B} = \text{R}575$$

Comparing the two options: Option A: R220 Option B: R575

The total monthly cost for option B is R575.
The cheaper option for using 250 minutes is Option A.

Choosing the wrong tariff can negatively impact Lelo's budget by leading to unnecessary expenses. For example, if Lelo chooses a contract with a high fixed fee but uses very few minutes, they pay for services they don't use. Conversely, if Lelo chooses a pay-as-you-go option but makes many calls, the high per-minute rates could result in a much larger bill than a contract with included minutes.

A bar scale is a visual representation of the scale, typically a line marked with distances, which remains accurate even if the map or plan is enlarged or reduced. A number scale (or ratio scale) is expressed as a ratio (e.g., 1:50), indicating that one unit on the plan represents a certain number of units in reality, but it becomes inaccurate if the map or plan is resized.

The scale 1:50 means that 1 unit of measurement on the plan represents 50 of the same units in actual size. For example, 1 cm on the plan corresponds to 50 cm in the real classroom.

The teacher's desk measures 6 cm on the plan.
The scale is 1:50.
Actual length in cm = Plan length $\times$ Scale factor

To convert centimetres to metres, divide by 100.

The actual length of the desk is:

The distance between two learners' desks is 4 cm on the plan.
The scale is 1:50.
Actual distance in cm = Plan distance $\times$ Scale factor

To convert centimetres to metres, divide by 100.

The actual distance between the desks is: