Question

Lenore lives in a state where sales tax is 10%. This means you can find the total cost of an item, including tax, by using the expression c + 0.10c, where c is the pre-tax price of the item.
Use the expression to find the total cost of an item that has a pre-tax price of $84.00.

Answer 1

Function is

• f(c)=c+0.10c

Put 84.00$

$\\ \tt\hookrightarrow 84.00+0.1(84.00)$

$\\ \tt\hookrightarrow 84.00+8.4$

$\\ \tt\hookrightarrow 92.4$