What is the sum of 9 0.1 and 9 0.01?
9个0.1与9个0.01的和是多少．
<gadget id="calculator">9 * 0.1</gadget>
<output>0.9</output>

<gadget id="calculator">9 * 0.01</gadget>
<output>0.09</output>

<gadget id="calculator">0.9 + 0.09</gadget>
<output>0.99</output>

<result>0.99</result>