The school planted 250 saplings last year, and the survival rate of these saplings was 80%. How many of these saplings survived?
学校去年栽树苗250棵，这批树苗的成活率是80%，求这批树苗有多少棵成活？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">250 * (4/5)</gadget>
<output>200</output>

<result>200</result>