After Mr. Liu retired, his monthly living expenses were 2,400 yuan, which accounted for 60% of his monthly pension. How much is Mr. Liu's monthly pension?
刘老师退休以后，每月生活支出2400元，正好占他月退休金的60%，刘老师每月的退休金是多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2_400 / (3/5)</gadget>
<output>4_000</output>

<result>4_000</result>