The purchase price of a commodity is 150 yuan, and the price is 200 yuan. The mall decides to sell it at a discount. In order to ensure that the profit is not less than 20%, how much discount at most
[200-150×(1+20%)]÷200×100%=10%
10% off at most
[200-150×(1+20%)]÷200×100%=10%
10% off at most