Calculate two-digit numbers by two-digit numbers vertically. One factor is 25, and pony transcribes the "3" in the tens digit of the other factor into "8". How much is the difference between the number calculated by Xiao Ma and the correct result.
列竖式计算两位数乘两位数．一个因数是25，小马把另一个因数十位上的"3"抄写成了"8"．小马算得的得数和正确的结果相差多少．
<gadget id="calculator">80 - 30</gadget>
<output>50</output>

<gadget id="calculator">25 * 50</gadget>
<output>1_250</output>

<result>1_250</result>