Aunt Li paid 300 yuan for a dress with a 20% discount, and the salesperson gave her 20 yuan. What was the original price of the dress?
李阿姨付了300元买了一件打八折的衣服，营业员找给她20元，这件衣服的原价是多少元．
<gadget id="calculator">300 - 20</gadget>
<output>280</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">280 / (4/5)</gadget>
<output>350</output>

<result>350</result>