Answer:
375< y < 525
Step-by-step explanation:
The minimum is 15* 25 = 375
the maximum is 15 * 35 =525
He can earn any amount between these two values
x = 20
y = 7.2
12/x = 9/15
9x = 180
12/x= y/12
12/20 = y/12
144 = 20y
y = 20
