The original price of a tape recorder is 220 yuan, and it will be sold at a 15% discount during the National Day. How much cheaper can it be?
一台录音机原价220元，国庆节期间打八五折出售，能便宜多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">220 * (3/20)</gadget>
<output>33</output>

<result>33</result>