In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: if a store owner increases a product ' s price by 20 percent and then increases this price by another 15 percent , what percent of the original price is the total price increase ?
Options: a ) 20 % , b ) 35 % , c ) 38 % , d ) 65 % , e ) 135 %
c