Answer:
(a). 32 copies
(b). $3060
Step-by-step explanation:
Solution for (a):
P = 60c + 1800
If P is $3720 then;
3720 = 60c + 1800
60c = 3720 - 1800 = 1920
c = [tex]\frac{1920}{60}[/tex] = 32 copies
Solution for (b):
P = 60c + 1800
If c is 21 then;
P = $60(21) + $1800
P = $1260 + $1800
P = $3060
