TV set is on promotion, and the current price is 720 yuan per set, which is (1/5) lower than before. How much was the original price per set?
一种电视机搞促销，现在售价每台720元，比原来降低了(1/5)，原来每台售价多少元？
<gadget id="calculator">1 / 5</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">720 / (4/5)</gadget>
<output>900</output>

<result>900</result>