The Garden Bureau planted 1,500 trees, and the survival rate was 98%. How many trees did not survive?
园林局种了1500棵树，成活率为98%，有多少棵树未成活？
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1_500 * (49/50)</gadget>
<output>1_470</output>

<gadget id="calculator">1_500 - 1_470</gadget>
<output>30</output>

<result>30</result>