There is a jacket in the store, which is 45 yuan cheaper after a 20% discount. How much is the original price of the jacket?
商店有一款上衣，打八折后便宜了45元，上衣原价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 / (1/5)</gadget>
<output>225</output>

<result>225</result>