Question

A shop recorded total sales of $2,000 on Monday. On Tuesday, its sales fell by 10%. On Wednesday, sales fell by another 20% compared with Tuesday. From Wednesday to Thursday, sales increased by an amount equal to 25% of Monday’s total sales. What is the net change in total sales from Monday to Thursday? The net change in total sales was .

Answer 1

Mon: $2000 Tue: 0.9*$2000 = $1800 Wed: 0.8*$1800 = $1440 Thu: $1440 + 0.25*$2000 = $1940 Net change = $1940 - $2000 = -$60 (-3%)

Answer 2

The net change in total sales was sale is decreases by 40.

Explanation:

Sale of shop on Monday = $2,000

On Tuesday sales of shop fell by 10%

∴ Sales of shop on Tuesday = $2,000 × (100-10)% = $1,800

On Wednesday sales of shop fell by 20% of Tuesday's sale

∴ Sales of shop on Tuesday = $1,800 × (100-20)% = $1,440

On Thursday sales of shop increased by 25% of Monday's Total sale

∴ Sales of shop on Thursday = $1,440 + (25 × 2000)% = 1440 + 500 = $1,940

The net change in total sales was sale is decreases by 40.