A piano, after a price reduction of 20%, is priced at 4,400 yuan. How much is the original price of this piano?
一架钢琴，降价20%后，售价是4400元．这架钢琴原价多少元？
<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">4_400 / (4/5)</gadget>
<output>5_500</output>

<result>5_500</result>