Shopping center

The shopping center buys from the manufacturer bikes at a purchase price of 180 €. It sells them for a sale price of 250 €. However, in the advertising for the sale of these goods, the shopping center spent 20% of the selling price of all bicycles in stock. How many bikes did the shopping center sell if they were to get 500 € profit?

Correct result:

n =  25

Solution:

n•(250-180) - 20/100 • 250•n = 500

2000n = 50000

n = 25

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