Aunt Yang, a self-employed individual, pays a business tax of 120 yuan based on 3% of her business income in May. How much is her business income this month?
个体户杨阿姨五月份按营业收入的3%交营业税120元，这个月她的营业收入是多少元．
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">120 / (3/100)</gadget>
<output>4_000</output>

<result>4_000</result>