The student drawers at the Olympic Math School are numbered starting from 1. The labels used to paste the numbers are plastic resin, and each number costs 2 cents. For example, a drawer labeled 9 costs 2 cents, while a drawer labeled 10 costs 4 cents. A total of 990 cents was spent after labeling. Q: How many drawers are there in total in this school?
奥林匹克数学学校的学生抽屉是从1开始标号的．用来贴数字的标签是塑料树脂，且贴每个数字要花2分钱．例如，抽屉标号为9的标签要花2分钱，而标号为10的标签则要花4分钱．若贴上标签后总共花了990分钱．问：这所学校共有多少个抽屉？
<gadget id="calculator">103 - 1</gadget>
<output>102</output>

<gadget id="calculator">9 + 90 + 102</gadget>
<output>201</output>

<result>201</result>