A set of tea sets is sold with a 20% discount, which is 10 yuan cheaper. What is the original price of this set of tea sets?
一套茶具打八折销售便宜了10元钱，这套茶具原价多少元．
<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">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>