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) = 6 + x; $161.06

f(x) = x – 6; $158.94

f(x) = 1.06x; $169.60

D. f(x) = 1.06x; $169.60

sales tax = 6% or 6/100.  

assuming tax is added onto the item:

total cost function f(x) = price + tax

however, assuming the cost price = sales price  - tax,  then:

f(x) = sales price - tax  

This is not really a business or accounting forum, its a maths forum, so you need to be clearer about business or accounting terms such as total cost, selling price, selling cost.

Step-by-step explanation:/p>

if y= the item after tax

y=x+(x*6%) or y=x+6%

and then for the answer you would go:

y=160+6% or 160+(160*6%)= $169.60