Add a 0 to the end of an integer, and the new number obtained is 1980 more than the original number. What is this number?
在一个整数的后面补上一个0，得到的新数比原来的数增加了1980，这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1_980 / 9</gadget>
<output>220</output>

<result>220</result>