There are 40 students in the third class of the sixth year, and each of them donated money to the Hope Project. One of the students donated 2.80 yuan. However, this number was wrongly calculated when the statistics were made. As a result, the calculated average donation per person in the class was 0.63 yuan higher than the actual average donation per person. When counting figures, take this figure as how many yuan.
六年三班有40名同学，每人都向希望工程捐了款．其中有一名同学捐了2.80元．但是统计数字时把这个数字搞错了，结果计算出的全班平均每人捐款数比实际平均每人捐款数高了0.63元．统计数字时把这个数字当成了多少元．
<gadget id="calculator">0.63 * 40</gadget>
<output>25.2</output>

<gadget id="calculator">25.2 + 2.8</gadget>
<output>28</output>

<result>28</result>