A sporting goods store sells a volleyball after a 20% price cut, and the price is 28 yuan each. What is the original price of this volleyball?
体育用品商店降价20%以后出售一种排球，售价是每个28元．这种排球原来售价是多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">28 / (4/5)</gadget>
<output>35</output>

<result>35</result>