Question

Roy wants to buy a fish tank thatusually costs $90, but is on sale for30% off. What is the sale price forthe fish tank?

Answer 1

The fish usually cost $90. A discount of 30% is

`\begin{gathered} (30)/(100)*90 \\ =(30*90)/(100) \\ =(3*9)/(1) \\ =3*9=27\text{ dollars } \\ \end{gathered}`

So, $27 off the original price of $90 becomes

`\begin{gathered} 90-27 \\ =63 \end{gathered}`

Hence the answer is $63