Subtract 40 sums of 0.25 from 30 and multiply by 0.05. What is the product?
从30里面减去40个0.25的和，再乘0.05，积是多少？
<gadget id="calculator">0.25 * 40</gadget>
<output>10</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">20 * 0.05</gadget>
<output>1</output>

<result>1</result>