Grandpa Zhang contracted a barren mountain to plant trees this year. A total of 5,000 trees were planted, only 4 of which did not survive. What is the survival rate of these trees?
张爷爷今年承包了一片荒山植树造林，共植树5000棵，只有4棵没有活，这批树的成活率是多少．
<gadget id="calculator">5_000 - 4</gadget>
<output>4_996</output>

<gadget id="calculator">4_996 / 5_000</gadget>
<output>1_249/1_250 = around 0.9992</output>

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

<gadget id="calculator">(1_249/1_250) * 1</gadget>
<output>1_249/1_250 = around 0.9992</output>

<result>1_249/1_250 = around 0.9992</result>