There used to be 30 boats in the People's Park, with a daily income of 540 yuan. According to this calculation, there are now 45 boats, how much more can I earn per day?
人民公园原来有30条船，每天收入540元．照这样计算，现在有45条船，每天可多收入多少元？
<gadget id="calculator">540 / 30</gadget>
<output>18</output>

<gadget id="calculator">18 * 45</gadget>
<output>810</output>

<gadget id="calculator">810 - 540</gadget>
<output>270</output>

<result>270</result>