A bicycle is priced at 153 yuan after a 15% discount, how much is it cheaper after the discount.
一辆自行车打八五折后售价153元，打折后便宜了多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">153 / (17/20)</gadget>
<output>180</output>

<gadget id="calculator">180 - 153</gadget>
<output>27</output>

<result>27</result>