The students in Class 1, Grade 5 planted 50 trees in total, and the survival rate was 98%. How many trees did not survive?
五年级1班同学共植树50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">50 * (49/50)</gadget>
<output>49</output>

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

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

<result>1</result>