The material used for a section of chimney is 9 square decimeters. If the circumference of the bottom of the chimney remains the same, the length must be increased by 50%. What is the area of the material used?
一节烟筒的用料是9平方分米，如果烟筒的底面周长不变，长要增加50%，用料面积是多少．
<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">9 * (3/2)</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>