Move the decimal point of a decimal two places to the right, and you have increased by 621.72. What is the original number?
一个小数的小数点向右移动两位，结果你原来增加了621.72．原来这个数是多少？
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">621.72 / 99</gadget>
<output>6.28</output>

<result>6.28</result>