The sales tax in one state is 3%. Write a function rule for finding the total cost of an item with selling price x. Then find the total cost of a CD player with a selling price of $150.
A, f(x)=x-3;$154.50
B, f(x)=x-3;$148.97
C, f(x)=0.03x;$4.50
D f(x)=3+x;$151.03
Somebody please answer the question as soon as possible. Thank You!