Question

From 1980 through 1990, the population of City Q increased by 20 percent. From 1990 through 2000, the population increased by 30 percent. what was the combined percent increase for the period 1980-2000?
A) 25%
B) 26%
C) 36%
D) 50%
E) 56%
Can u guys explain this for me please

Answer 1

An increase in 20% means multiplying to 1.20.
An increase in 30% means multiplying by 1.30.

So let's say that we start with a population "P".

P*(1.20) = 20% growth of population P.
[P*(1.20)]*(1.30) = 20% growth followed by a 30% growth.

So the question is asking... what is 1.20 times 1.30?

hope this helps. :)

Answer 2

ehh i still dont get it :(

Answer 3

Ok.

Do you understand what it means to "take x percent of a number?"

Like if I said, there is a new tax in place which will take 27% of your total income each year. If you make 46,000 per year, how much will you have left AFTER the tax is taken away?

Answer 4

so 27% of 46000