The sales tax in one state is 6%. 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 $160.

f(x) = 0.06x; $9.60

f(x) = 1.06x; $169.60

f(x) = x – 6; $158.94

f(x) = 6 + x; $161.06

Question

The sales tax in one state is 6%. 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 $160.

f(x) = 0.06x; $9.60
	
f(x) = 1.06x; $169.60
	
f(x) = x – 6; $158.94
	
f(x) = 6 + x; $161.06

Mercury · Answer

thoughts?

the total cost can be thought of as:

(price of the item) + (6% of the item price)

if we represent "price of the item" as an unknown x, and "6% of the item price" as a decimal expression (0.06x), and add them together, what do we get?