(1+20%)x=15．
(1+20%)x=15．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">15 / (6/5)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>