If the price of a commodity is increased by 30% and then decreased by 30%, what is the current price of the original price?
一种商品，先提价30%，又降价30%，现在的价格是原来价格的多少
<gadget id="calculator">130 / 100</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) / 1</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 * (13/10) * (7/10)</gadget>
<output>91/100 = around 0.91</output>

<result>91/100 = around 0.91</result>