For a number, the decimal point is moved two places to the right, and the number obtained is 247.5 more than the original number. What is the original number?
一个数，小数点向右移动两位，得到的数比原来的数多247.5，原来的数是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">247.5 / 99</gadget>
<output>2.5</output>

<result>2.5</result>