The mining team mined a total of 4,500 tons last year. This year's mining volume increased by 20% compared to last year. How many tons were mined in total in two years?
采矿队去年共采矿4500吨，今年采矿量比去年增产20%，两年一共采矿多少吨？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">4_500 * (6/5)</gadget>
<output>5_400</output>

<gadget id="calculator">5_400 + 4_500</gadget>
<output>9_900</output>

<result>9_900</result>