Assuming that the purchase price of fruits is P and the total purchase quantity is W, the total cost of this batch of fruits is C = P * W；;

Regardless of the cost of other supermarkets, in order to make a profit of at least 20%, there are:

The gross fruit profit Cr = c * (1+20%) =1.2 * c =1.2 * p * w, while the gross fruit weight wr = w * (/kloc- To sum up, the price of fruit at this time is PR = Cr/WR = (1.2 * p * w)/(0.9 * w) =1.333p.

Therefore, in order to make a profit of 20%, the price of fruit will increase by 33.3% on the basis of the purchase price.