The turnover of Dongfang Supermarket in the first three days of June was 489 yuan, 713 yuan and 598 yuan respectively. How much is your turnover this month?
东方超市六月份前3天的营业额分别是489元、713元、598元．这个月的营业额大约是多少钱？
<gadget id="calculator">489 + 713 + 598</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 3</gadget>
<output>600</output>

<gadget id="calculator">600 * 30</gadget>
<output>18_000</output>

<result>18_000</result>