SOLUTION: 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

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 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       Log On


   

Question 982160: 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.

A. f(x) = 5 + x; $111.05
B. f(x) = 0.05x; $5.50
C. f(x) = x – 5; $108.95
D. f(x) =1.05x; $115.50

Found 2 solutions by olliegray1, jim_thompson5910:
Answer by olliegray1(1) About Me  (Show Source):
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
total cost = (price) + (5% of price)
f(x) = x + 0.05x
f(x) = 1.05x

So the function is f(x) = 1.05x

Plug in x = 110 to get

f(x) = 1.05x
f(110) = 1.05*110
f(110) = 115.50

The item costs $115.50 (after tax is added on)