set of clothes costs 180 yuan, and the price of the trousers is 80% of that of the jacket. How much is the price of the jacket?
一套衣服共180元，裤子的价格是上衣的80%，上衣的价格是多少元？
<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<gadget id="calculator">100 / 180</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">180 * (5/9)</gadget>
<output>100</output>

<result>100</result>