Question

A shopper Pais $432 for a item marked $400 what is the percent of the sales tax

Answer 1

Let the % of the sames tax be x, then


`400\left( (100+x)/(100) \right)=432 \\ \\ \Rightarrow\left( (100+x)/(100) \right)= (432)/(400) =1.08 \\ \\ \Rightarrow100+x=100(1.08)=108 \\ \\ \Rightarrow x=108-100=8\%`

Therefore, the percent of the sales tax is 8%.