Dad’s monthly salary is 2,500 yuan, and mother’s monthly salary is 2,000 yuan. Our family’s monthly expenses account for about 2/5 of their salary. How much is our family’s monthly balance?
爸爸每月工资是2500元，妈妈每月工资2000元，我们家每月开支大约要占两人工资的(2/5)，我们家每月大约结余多少元？
<gadget id="calculator">2_500 + 2_000</gadget>
<output>4_500</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4_500 * (3/5)</gadget>
<output>2_700</output>

<result>2_700</result>