The sales tax in one state is 7%. 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.
f(x) = x – 7; $148.93
f(x) = 7 + x; $151.07
f(x) = 1.07x; $160.50
f(x) = 0.07x; $10.50
To find the total cost of an item with a selling price x, you would multiply the selling price by 1.07 (since the sales tax is 7%). Therefore, the correct function rule would be:
f(x) = 1.07x
Now, to find the total cost of a CD player with a selling price of $150, you would plug in x = 150 into the function:
f(150) = 1.07(150)
f(150) = 160.50
Therefore, the total cost of a CD player with a selling price of $150 would be $160.50.