The number of trees planted last year was 50% more than the number of surviving trees in the previous year, and the survival rate of last year was 80%.
去年植树的数量比前年成活的树多50%，去年的成活率是80%，去年成活的树木量是前年成活树木的百分之几？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/2) * (4/5)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>