The original price of a commodity in a shopping mall is a yuan. Because it is unsalable, the price of the commodity is reduced by 10% and then by 10%. The algebraic expression containing a is used to express the price of the commodity after the price is increased In a shopping mall, the original price of a commodity is a yuan. Because it is unsalable, the price will be reduced by 10% and then by 10%. Later, the sales will be increased by 20% because of the sharp increase in sales. The algebraic expression containing a is used to express the price of the commodity after the price increase and simplify the algebraic expression

The original price of a commodity in a shopping mall is a yuan. Because it is unsalable, the price of the commodity is reduced by 10% and then by 10%. The algebraic expression containing a is used to express the price of the commodity after the price is increased In a shopping mall, the original price of a commodity is a yuan. Because it is unsalable, the price will be reduced by 10% and then by 10%. Later, the sales will be increased by 20% because of the sharp increase in sales. The algebraic expression containing a is used to express the price of the commodity after the price increase and simplify the algebraic expression

a（1+10%）（1-10%）（1+20%）
=a*1.1*0.9*1.2
=0.99a *1.2
=1.188a