The forest farm planted 10,000 trees last year, and the mortality rate was 2%. How many trees survived?
林场去年种了10000棵树，死亡率为2%，成活了多少棵．
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 - (1/50)</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">10_000 * (49/50)</gadget>
<output>9_800</output>

<result>9_800</result>