C=1500+4x where x is cds, C is cost
R=10x where R is revenue
then, P=R-C
P=10x-1500-4x
P=6x-1500
set P=0
1500=6x
x=250
check, C=1500+4*250, R=10*250
C=250, R=250
They need to sell 250 cds before they make profit
T= 54/(150x0.06) =6 years
Answer: C.
Step-by-step explanation:
The population rises exponentially, so the graph will have to go up. It also means the population is doubled directly in relation to days