Let the answer be x percent:
So we say: the tax is x% of the price,
this means: $3.56 is x% of $89
"something %" means 1/100 times something,
thus, we write and solve the following equation:
[tex]\displaystyle{ 3.56= \frac{x}{100}\cdot 89 [/tex]
[tex]3.56\cdot100=x\cdot89[/tex]
[tex]356=89x[/tex]
[tex]\displaystyle{ x= \frac{356}{89}= 4[/tex]
Answer: the tax is 4%
