The purchase price of a TV is a yuan, the retail price is 1100 yuan, the store sells it at 80% of the retail price, and still can make a profit of 10%, then a = how much yuan.
一台电视的进价是a元，零售价是1100元，商店按零售价的80%出售，仍可获利10%，则a=多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_100 * (4/5)</gadget>
<output>880</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">880 / (11/10)</gadget>
<output>800</output>

<result>800</result>