Dad’s monthly salary this year is 2,200 yuan, an increase of 10% from last year. How much was Dad’s monthly salary last year?
爸爸今年的月工资是2200元，比去年增加了10%，爸爸去年的月工资是多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">2_200 / (11/10)</gadget>
<output>2_000</output>

<result>2_000</result>