Question 1170952

State sales tax {{{y }}}is directly proportional to retail price {{{x }}}. 

{{{y=kx}}}

if an item that sells for {{{178}}} dollars has a sales tax of {{{10.22}}} dollars and the tax is proportional to the price, the tax ratio is 

{{{k=10.22/178=0.0574}}}

Find a mathematical model that gives the amount of sales tax {{{y }}}in terms of the retail price {{{x}}} .

 answer is:

 {{{y =0.0574x}}}


b. What is the sales tax on a {{{310}}} dollars purchase?

{{{y =0.0574x}}}

{{{y=0.0574*310}}}

{{{y=17.79}}} dollars