Question

What was the percent increase in the population of City K from 1980 to 1990 ? (1) In 1970 the population of City K was 160,000. (2) In 1980 the population of City K was 20 percent greater than it was in 1970, and in 1990 the population of City K was 30 percent greater than it was in 1970.?

Answer 1

Answer:

5.71% was the percent increase in the population of City K from 1980 to 1990 .

Explanation:

In 1970 the population of City K = 160,000

In 1980 the population of City K was 20 percent greater than it was in 1970:

160,000 + 20% of 160,000 =160,000 + 32,000 = 192,000

In 1990 the population of City K was 30 percent greater than it was in 1970:

160,000 + 30% of 160,000 =160,000 + 48,000 = 208,000

Percent increase in the population of City K from 1980 to 1990:

$\frac{208,000-192,000}{192,000}\times 100=8.33\%$

8.33% was the percent increase in the population of City K from 1980 to 1990 .