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The profit problem of primary school mathematics
Assume that the total amount of commodities is 100 unit, and the cost of each commodity is also 100 unit.

The total cost of goods is100×100 =10000.

Then according to the profit of 30%, the price is 130, the sales rate is 70%, and the sales income is 130×70=9 100.

The remaining 30% is sold at half the price of 65, and the sales income is 65×30= 1950.

Total sales revenue is 9100+1950 =11050.

The profit is11050-10000 =1050.