supermarket buys a batch of commodities from the manufacturer at a price of 21 yuan each. The supermarket can set its own price, but the price bureau limits the price increase of each commodity to no more than 20% of the purchase price, so the price of this batch of commodities cannot exceed how many yuan ．
某超市从厂家以每件21元的价格购进一批商品，该超市可以自行定价，但物价局限定每件商品加价不能超过进价的20%，则这批商品的售价不能超过多少元．
<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">21 * (6/5)</gadget>
<output>126/5 = around 25.2</output>

<result>126/5 = around 25.2</result>