When Xiaojun did the calculation of multiplying two digits by two digits, he regarded the 1 in the 21 digits of the second factor as 7, and the result was 72 more than the correct product. What should the correct product be?
小军在做两位数乘两位数的计算时，把第二个因数21个位上的1看成了7，结果比正确的积多了72，正确的积应该是多少．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">72 / 6</gadget>
<output>12</output>

<gadget id="calculator">12 * 21</gadget>
<output>252</output>

<result>252</result>