The 20% discount for a commodity is 150 yuan, what is the 30% discount?
一种商品八折优惠是150元，七折优惠是多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 / (4/5)</gadget>
<output>375/2 = around 187.5</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(375/2) * (7/10)</gadget>
<output>525/4 = around 131.25</output>

<result>525/4 = around 131.25</result>