Question

Luis left a 15% tip on a $30.00 food bill.How much did he leave for the tip?

Answer 1

he spent $4.50 on the tip

Answer 2

We need to calculate 15% of $30 here. To do that we put 15 over 100 and multiply all by 30.
$\frac{15}{100} *30$
Simplify.
$\frac{15}{10} *3$
$\frac{45}{10}$
$\frac{9}{2}$
9/2 is equal to $4.5.