Say currently both a dozen eggs and 10 pounds of apples cost $50 (they are at the same price). So, to buy a dozen eggs and 10 pounds of apples we need $100.

After the increase, the price of a dozen eggs will be $55 and the price of 10 pounds of apples will be $51. So after the increase, to buy a dozen eggs and 10 pounds of apples we'll need $106.

Increase = 6%.

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