Raghuvir purchased some perishable items for sale but 36% of those items could not be sold and went bad. However, Raghuvir managed to sell the rest of the items at a price that helped him earn an overall profit of 28%. At what percentage above the cost price of each item did Raghuvir sell each of the items that did not go bad?

Since this problem can be directly solved using the % logic. Let's assume that the CP is 100. When 36% of it is destroyed, we are left with 64. This is our new CP. The overall profit should be 28%. Profit is always calculated on the original cost price. This means that the SP should be 128 (100*28% +100). Now the goods we have are worth Rs64. We need to markup these goods so that they become Rs.128. This means 128-64= 64 is the markup required. Hence, they are marked up by 64/64*100 = 100%.