The number of stores owned by Star Discount in 2015 was twice the number owned by Star Discount in 2010. By approximately what percent did the average annual earnings per store increase from 2010 to 2015 ?
The number of stores owned by Star Discount in 2015 was twice the number owned by Star Discount in 2010. By approximately what percent did the average annual earnings per store increase from 2010 to 2015 ?