1 kilogram of tea leaves is 40 yuan, how much will you pay for (3/4) kilograms?
1千克茶叶40元，买(3/4)千克，要付多少元．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 * (3/4)</gadget>
<output>30</output>

<result>30</result>