# Mr. Salas receives a 10% raise every year. His salary after four such raises has gone up by what percent?

Jun 24, 2016

10%xx4=40%

#### Explanation:

Mr. Salas receives a yearly raise of 10%

$r$ = 10% = the rate of his yearly raise

$t$ = 1 = the number of times he receives the 10% raise in one year

$x$ = 4 = the number of raises Mr. Salas received

$y$ = 40% = the amount his raise has gone up since year 1

rxxtxxx=y=10%xx1xx4=40%

After four 10% raises, Mr. Salas has earned 40% of his original salary which was 40% less than what he earns now.