Answer:
Step-by-step explanation:
$4000(0.10) = $400
which is less than her paid commission
so we know that she sold more than $4000 worth
if s is sales above $4000
$2530 = 400 + 0.15s
$2130 = 0.15s
s = $14200
so total sales x is
x = $4000 + $14200 = $18200