After the decimal point of a number is moved two places to the left, it is 247.5 smaller than the original number. Find the original number.
一个数的小数点向左移动两位后，比原来的数小247.5，求原来的数是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

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

<gadget id="calculator">2.5 * 100</gadget>
<output>250</output>

<result>250</result>