The table below shows the record of sales in a week. Use it to answer the questions below.

The highest amount is N8,700, which occurred on Thursday.  
The day with the highest amount of sales was **Thursday**.
$$
\boxed{\text{Thursday}}
$$

2. Step 1: Identify the sales amount for each day. Monday: N2,500 Tuesday: N2,500 Wednesday: N4,800 Thursday: N8,700 Friday: N1,500 Saturday: N7,000

The lowest amount is N1,500, which occurred on Friday.  
The day with the lowest amount of sales was **Friday**.
$$
\boxed{\text{Friday}}
$$

3. Step 1: Examine the sales amounts for identical values. Monday sales: N2,500 Tuesday sales: N2,500 The days that recorded equal amounts of sales are Monday and Tuesday. $\boxed{\text{Monday and Tuesday}}$

4. Step 1: Identify Saturday and Friday sales. Saturday sales = N7,000 Friday sales = N1,500

$$
\text{Difference} = \text{N}7,000 - \text{N}1,500 = \text{N}5,500
$$
Saturday sales were greater than Friday sales by **N5,500**.
$$
\boxed{\text{N}5,500}
$$

5. Step 1: Identify Tuesday and Monday sales. Tuesday sales = N2,500 Monday sales = N2,500

$$
\text{Difference} = \text{N}2,500 - \text{N}2,500 = \text{N}0
$$
Tuesday sales were greater than Monday sales by **N0**.
$$
\boxed{\text{N}0}
$$

6. Step 1: Identify Saturday, Monday, and Tuesday sales. Saturday sales = N7,000 Monday sales = N2,500 Tuesday sales = N2,500

$$
\text{Difference} = \text{N}7,000 - \text{N}5,000 = \text{N}2,000
$$
Saturday sales were greater than Monday and Tuesday sales by **N2,000**.
$$
\boxed{\text{N}2,000}
$$

7. Step 1: Identify the highest sales amount (Thursday: N8,700).

The next highest amount after Thursday's N8,700 is N7,000, which occurred on Saturday.  
Another highest amount was recorded on **Saturday**.
$$
\boxed{\text{Saturday}}
$$

8. Step 1: Sum all sales for the week. $\text{Total sales} = \text{N}2,500 + \text{N}2,500 + \text{N}4,800 + \text{N}8,700 + \text{N}1,500 + \text{N}7,000 = \text{N}27,000$

$$
\text{Average sales} = \frac{\text{Total sales}}{\text{Number of days}} = \frac{\text{N}27,000}{6} = \text{N}4,500
$$
The average sales for the week is **N4,500**.
$$
\boxed{\text{N}4,500}
$$

9. Step 1: Sum sales from Monday to Friday. $\text{Sales (Mon-Fri)} = \text{N}2,500 + \text{N}2,500 + \text{N}4,800 + \text{N}8,700 + \text{N}1,500 = \text{N}20,000$ The sales recorded from Monday to Friday was N20,000. $\boxed{\text{N}20,000}$

10. Step 1: Sum all sales for the week (Monday to Saturday). $$\text{Total sales} = \text{N}2,500 + \text{N}2,500 + \text{N}4,800 + \text{N}8,700 + \text{N}1,500 + \text{N}7,000 = \text{N}27,000$$ The total sales for the week is N27,000. $$\boxed{\text{N}27,000}$$