y = 25x - 2
the above equation represent the cost of 4Y6 prints
he wants to order between 15 and 20 of 4Y6 prints
the minimum is 15 and maximum is 20
x could be 15 or 20
Y = 25(15) - 2
y = 375 - 2
y = 373
for x = 20
y = 25(20) -2
y = 500 - 2
y = 498
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