ANSWER
P(n)=2n-125
Step-by-step explanation
Profit equals selling price minus cost price.
P(n)=R(n)-C(n)
The cost price is given by the function;
C(n)= 2n + 125
The selling price is represented by the function:
R(n)=4n
The function that represents the profit function is :
P(n)=4n-(2n+125)
Expand
P(n)=4n-2n-125
Simplify:
P(n)=2n-125