The survival rate of a tree is 95%. If the school plants 200 trees this year, how much can it survive at most?
一种树的成活率是95%，学校今年植树200棵，最多能成活多少
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">200 * (19/20)</gadget>
<output>190</output>

<result>190</result>