There are 1.8 hectares of peach groves in the pollution-free forest farm of Zhuwan Village. This year, an average of 500 tons of peaches are harvested per hectare, an increase of 25% over last year. How many tons of peaches did this forest farm harvest last year?
朱湾村无公害林场有1.8公顷桃树林，今年平均每公顷收桃子500吨，比去年增产二成五．这个林场去年收桃子多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1.8 / (5/4)</gadget>
<output>1.44</output>

<gadget id="calculator">500 * 1.44</gadget>
<output>720</output>

<result>720</result>