Two stores, A and B, initially sell a commodity at the same price. A week later, store A reduced the price of this product by 10%, and after another week, the price increased by 20%. Store B did not raise the price of this product by 20% until two weeks later. Then, after two weeks, what percentage of the price of this commodity in store A is the price of store B?
甲乙两个商店开始时以同样的价格出售某种商品．一个星期后，甲商店将这种商品的售价降低了10%，又过了一星期，售价又提高了20%．乙商店在两星期后才把这种商品的售价提高20%．那么，两个星期后，这种商品在甲商店的售价是乙商店的售价的百分之几？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(9/10) * (6/5)</gadget>
<output>27/25 = around 1.08</output>

<gadget id="calculator">(27/25) / (6/5)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>