Question

A new law requires that 15% of an individuals income be invested in the stock market. Your accounts show that you need to put $435 in the stock market this year. How much did you learn this year?

Answer 1

This year's earnings were $2900

Explanation:

Percentage calculation

If a number N is given and we need to calculate X percent of it, it's given by

`\displaystyle P=N(X)/(100)`

But what happens if we already know P and want to compute N? We simply solve for N

`\displaystyle N=P(100)/(x)`

The question tells us we need to put $435 in the stock market this year, and it's 15% of the yearly income. We have P=435, X=15, let's compute N

`\displaystyle N=435(100)/(15)`

`\boxed{N=\$2900}`

This year's earnings were $2900