A certain county harvested a total of 87.5 million tons of grain in the year before last, an increase of 15% compared to the previous year last year. How many tons was the increase last year compared to the previous year?
某县前年粮食共收8750万吨，去年比前年增产一成半，去年比前年增产多少万吨？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">8_750 * (3/20)</gadget>
<output>2_625/2 = around 1_312.5</output>

<result>2_625/2 = around 1_312.5</result>