Answer:
$2,812.50
Step-by-step explanation:
Let
y ----> amount that Sarah earn this month
x ----> amount of sales over $5,750
we know that
5%=5/100=0.05
The linear equation that represent this situation is
y=4(525)+0.05(x)
Find the value of x
x=20,000-5750=$14,250
substitute
y=4(525)+0.05(14,250)=$2,812.50