The population of a city is expected to increase by 7.5 percent next year. if p repressents he current population which expression represents the expected populations next year

There are at least a few ways to express it, one of them being:

p' = p + 0.075p

p' is for population in the upcoming year.

0.075 is as much as 7.5%, so we just add current population and the value of expected increase.