Question

At 10 a.m., there were 12 people in a swimming pool. At 11 a.m., there were 27 people in the pool. What was the percent of increase in the number of people in the swimming pool from 10 a.m. to 11 a.m.?

Answer 1

if at 10 Am there were

10 AM.......................12 people
11 AM........................27 people

we see that in an hour the number of people increased by
27-12=15

1 percent of 12 is
12/100=0.12
15/.12=125
the increase was 125%