The purchase price of a certain toy airplane is 100 yuan. A certain store purchases 20 planes and sells them after raising the price by 20%. After a period of time, no one buys them. So how much did the owner earn in total?
某种玩具飞机进价100元，某店进货20架，提价20%后销售，一段时间后发现无人购买，店主决定打九折出售，结果销售一空．那么店主共赚了多少元．
<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">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 * (6/5) * (9/10) * 20</gadget>
<output>2_160</output>

<gadget id="calculator">100 * 20</gadget>
<output>2_000</output>

<gadget id="calculator">2_160 - 2_000</gadget>
<output>160</output>

<result>160</result>