Step-by-step explanation: if you set up a proportion 1/5 = x/100 (1/5 is the allowance she saves out of the amount she earns, and x/100 is the proportion for a %). Cross multiply. 100=5x, then solve the equation. 100/5 is 20. Therefore 1/5 is 20%.
The answer is 2 3/4 because Kelley grew just as much as Cole. You might have to simplify some of the answers in your multiple choice question do it makes 2 3/4.