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.?

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:

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