Naughty originally had 100 yuan. After 10% was used, the remaining 5% was used. How much money is left?
淘气原来有100元钱，用去10%后，又用去剩下5%，还剩下多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">100 * (9/10) * (19/20)</gadget>
<output>171/2 = around 85.5</output>

<result>171/2 = around 85.5</result>