A shop has a 20% discount promotion, Li Hong bought a basketball and saved 20 yuan, what is the original price of the ball?
某商店八折促销，李红买了一个篮球省了20元，该球的原价是多少元？
<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">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>