A shopping mall increased the price of a certain product by 30% before the "May 1st" festival, and then sold it at a 20% discount during the "May 1st" festival. As a result, the store earned an additional 26.4 yuan on the basis of the original price. How much is the original price?
一家商场在"五一"节来临之前，把某件商品加价30%，后来在"五一"节期间打八折出售，结果商店在原价的基础上又多赚了26.4元，这件商品的原价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * (3/10)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">(6/25) - 1</gadget>
<output>-19/25 = around -0.76</output>

<gadget id="calculator">(4/5) + (-19/25)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">26.4 / (1/25)</gadget>
<output>660</output>

<result>660</result>