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The arithmetic problem on the dining table records how many kilograms of food you bought in a day.
Let two purchase prices be X 1 and X2 respectively.

Then the average price of A is (x 1+x2)/2.

The average price of b is x 1x2/(x 1+x2).

Comparison of two average prices: (x1+x2)/2: x1x2/(x1+x2) = (x1+x2) 2/2x1x2 >/kloc-0

Therefore, the average price of B is lower and the cost performance is higher.

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