During the month of February, Fabulous Feet Shoe Mart sold 48 pairs of red loafers. After an ad campaign to boost sales, they sold 60 pairs in March. Find the percent of increase in sales.

A. 29%

B. 19%

C. 25%

D. 15%

we are given an initial count of pairs of red loafers of 48 in February and a count of 60 pairs in March. The percent increase follows the formula (after substitution) (60-48) / 48 * 100% equal to 25 percent. This is positive because the number of pairs sold has increased