Class 6 and Class 5 planted 200 trees in total, and the survival rate was 98%. How many trees did not survive?
六5班同学共植树200棵，成活率是98%，没有成活的树有多少棵．
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">200 * (1/50)</gadget>
<output>4</output>

<result>4</result>