If a commodity with a price of 800 yuan is sold at a 10% discount and still makes a profit of 20%, the purchase price of the commodity is( a576 b600 c640 d720

If a commodity with a price of 800 yuan is sold at a 10% discount and still makes a profit of 20%, the purchase price of the commodity is( a576 b600 c640 d720

Suppose the purchase price of this commodity is x yuan, then
(800*0.9)-x=0.2x
x=600
So choose B