A mobile phone with a 30% discount is 630 yuan. What is the original price of this mobile phone?
一款手机七折出售是630元，这款手机原价是多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">630 / (7/10)</gadget>
<output>900</output>

<result>900</result>