250 trees were planted on Arbor Day this year, and 50 of them did not survive. What is the survival rate of the trees planted this year?
今年植树节植树250棵，50棵没有活，今年植树的成活率是多少．
<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<gadget id="calculator">200 / 250</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>