$250
1) Gathering the data
Weekly Salary = $200
+ 5%
Total sales in one week = $1000
2) We can find the earnings of Stacy calculating this. Let's convert 5% to 0.05
Earnings = 200 + 1000 x (0.05)
E= 200 +50
E= 250
3) So Stacy should earn in 1 week $250 (salary +sales percentage).