The population of city X increased from 325,000 in 1980 to 350,000 in

Population increase from 1980 to 1990 = 350,000 - 325,000 = 25,000

This means the population increase from 1990 to 2000 = 25,000

So, to find the projected percent increase from 1990 to 2000, we must convert \(\frac{25,000}{350,000}\) to a percent.

To do so, take: \(\frac{25,000}{350,000}\)

Divide numerator and denominator by 10,000 to get: \(\frac{2.5}{35}\)

STRATEGY: Rather than perform any long division here, we can use the property that k/100 = k%

So, we want to take \(\frac{2.5}{35}\) and multiply numerator and denominator by the same value so that the new (equivalent) fraction has 100 in the denominator.
To accomplish this, we will multiply numerator and denominator by a number a little bit less than 3.
When we do so we get: (some number a little bit less than 7.5)/100 which equals a little bit less than 7.5%, which means the correct answer must be A