A shopkeeper sells two items, A and B. Item B's cost price is twice as that of item A. The shopkeeper sells item A at 10% profit and item B at 20% profit. Which one of the following is the value of net profit?
The combined cost price is 3x (x for item A and 2x for item B). Profits are 0.1x and 0.4x for A and B, respectively, totaling 0.5x. The net profit percentage is (0.5x/3x)*100% = 16.66%.