A TV is now priced at 720 yuan per set, which is lower than before (4/19). How much was each set in the past?
一种电视机现在每台售价720元，比原来降低(4/19)，原来每台多少钱？
<gadget id="calculator">4 / 19</gadget>
<output>4/19 = around 0.210526</output>

<gadget id="calculator">1 - (4/19)</gadget>
<output>15/19 = around 0.789474</output>

<gadget id="calculator">720 / (15/19)</gadget>
<output>912</output>

<result>912</result>