Last year's agricultural income was 300,000 yuan. This year's income increased by 15% compared with last year. How much is the increase?
去年农业收入是30万元，今年收入比去年增产15%，增产多少万元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">30 * (3/20)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>