100-(how much-5.6)*0.15=97.87.
100-(多少-5.6)*0.15=97.87．
<gadget id="calculator">100 - 97.87</gadget>
<output>2.13</output>

<gadget id="calculator">2.13 / 0.15</gadget>
<output>14.2</output>

<gadget id="calculator">14.2 + 5.6</gadget>
<output>19.8</output>

<result>19.8</result>