A TV is now priced at 900 yuan, which is cheaper than the original price (3/10). How much was the original price of this TV?
一台电视现在售价900元，比原价便宜了(3/10)，这台电视机原来的售价是多少元？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">900 / (7/10)</gadget>
<output>9_000/7 = around 1_285.714286</output>

<result>9_000/7 = around 1_285.714286</result>