A person bought one kilogram of apples for Rs. 60 and sold for Rs. 90. The percentage of profit of cost price he earned is?

50%

20%

25%

None of these

Cost Price (CP) = Rs. 60

Selling Price (SP) = Rs. 90

Profit = SP - CP = Rs. 90 - Rs. 60 = Rs. 30

Profit percentage = (Profit / CP) * 100

= (30 / 60) * 100

= 50%