If a commodity is sold at the fixed price, the profit will be 650 yuan, but if it is sold at 80% of the fixed price, the loss will be 480 yuan. Q: How much is the purchase price of the product?
某种商品按定价卖出可得利润650元，若按定价的80%出售，则亏损480元．问：商品的购入价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">650 * (4/5)</gadget>
<output>520</output>

<gadget id="calculator">520 + 480</gadget>
<output>1_000</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_000 / (1/5)</gadget>
<output>5_000</output>

<result>5_000</result>