I originally had 16.32 yuan, but my mother gave me another 0.65 yuan yesterday, and today I bought a pen for 8.5 yuan. How much money do I have now?
我原来有16.32元，昨天妈妈又给我0.65元，今天我用8.5元买了一支钢笔．现在我还有多少钱？
<gadget id="calculator">0.65 - 8.5</gadget>
<output>-7.85</output>

<gadget id="calculator">16.32 + (-7.85)</gadget>
<output>8.47</output>

<result>8.47</result>