There is a style of MP3 that is sold at 70% off for 84 yuan. How much is the original price?
有一种款式的MP3，打三折出售是84元，原价多少元？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">84 / (3/10)</gadget>
<output>280</output>

<result>280</result>