Uncle Li is going to buy a washing machine with the original price of 1800 yuan. How much does it actually cost? How much is the discount

Uncle Li is going to buy a washing machine with the original price of 1800 yuan. How much does it actually cost? How much is the discount

Less 1800 △ 200x20 = 9x20 = 180 yuan
1800-180 = 1620 yuan
1620÷1800=0.9
A: the actual payment of 1620 yuan is 10% off