When the little sloppy is doing the calculation of multiplying two digits by two digits, he regards the 8 in the unit digit of a multiplier 28 as 3, and the result is 75 less than the correct product. What is the correct result?
小马虎在做两位数乘两位数的计算时，把一个乘数28的个位上的8看作3，结果比正确的积少了75，正确的结果是多少？
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">28 * 15</gadget>
<output>420</output>

<result>420</result>