The sales tax in one state is 5%. 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 $110.
f(x) = 1.05x; $115.50
f(x) = x – 5; $108.95
f(x) = 5 + x; $111.05
f(x) = 0.05x; $5.50
f(x) = 1.05x
Total cost of a CD player with a selling price of $110:
f(110) = 1.05(110) = $115.50
Therefore, the total cost of a CD player with a selling price of $110 is $115.50.