Answer
Find out the what is his gross pay for that week .
To prove
As given
Edgar Anderson earns $300 a week plus a 15% commission only on sales he makes after his first $1000 in sales.
If Mr. Anderson’s sales for one week are $2,500 .
15 % is written in the decimal form

= 0.15
As 15% commission only on sales he makes after his first $1000 in sales and Mr. Anderson’s sales for one week are $2,500 .
Thus
Commission price = 0.15 × (2500 - 1000)
= 0.15 × (1500)
= $225
Thus
Total gross pay of Edgar Anderson for that week = $300 + $225
= $ 525
Therefore the total gross pay of Edgar Anderson for that week is $525.