A shop can still make a profit of 20% by selling a certain product at a 10% discount on the listed price. If the purchase price of the product is 1980 yuan, what is the price tag?
商店把某种货物按标价九折出售，仍可获利20%，如果该货物的进价是1980元，那么标价是多少元．
<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">1_980 * (6/5)</gadget>
<output>2_376</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">2_376 / (9/10)</gadget>
<output>2_640</output>

<result>2_640</result>