Hongxing Coal Mine produces 450,000 tons of coal this year, an increase of 25% over last year. How many tons of coal will it produce in seven years?
红星煤矿今年产煤45万吨，比去年增产25%，七年产煤多少万吨？
<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">45 / (5/4)</gadget>
<output>36</output>

<result>36</result>