25% off a radio. Buying one now is 15 yuan cheaper than before. How much is the original price of this radio?
一个收音机七五折．现在买一台比原来便宜15元．这种收音机原价多少元？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>