Jackie made 28$ babysitting last week . her brother John made only 86% as much as she did. How much did john make

[tex]86 \% \ of \ 28\$= \frac{86}{100} *28= \frac{2408}{100}= \\ \\ =\boxed{24.08 \$ - earned \ John}[/tex]

$24.08 I'm pretty sure.You do this on a calculator. You type in: 28  ÷ 86 and then the percent button which will give you the answer, for any question like that is the same formula.