Changjiang Huiyuan Mango Orchard originally planned to harvest 120 tons of mangoes last year, but actually harvested 138 tons of mangoes.
昌江汇源芒果园去年原计划收得芒果120吨，实际收得芒果138吨，实际收得芒果比原计划增加百分之几？
<gadget id="calculator">138 - 120</gadget>
<output>18</output>

<gadget id="calculator">18 / 120</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>