When a student multiplied two two-digit numbers, he mistook the one-digit 9 of one of the multipliers for a 7, and the resulting product was 756. What is the correct product.
一名学生在做两个两位数乘法时，把其中的一个乘数的个位数字9误看成7，得出的乘积是756．正确的乘积是多少．
<gadget id="calculator">28 * 29</gadget>
<output>812</output>

<result>812</result>