Yucai Primary School planted trees in spring, 150 survived, and 12 did not survive. What percentage of the total number of trees planted did not survive?
育才小学春季植树，成活了150棵，没有成活的有12棵，没有成活的占植树总棵数的几分之几？
<gadget id="calculator">150 + 12</gadget>
<output>162</output>

<gadget id="calculator">12 / 162</gadget>
<output>2/27 = around 0.074074</output>

<result>2/27 = around 0.074074</result>