The students planted trees, 397 trees survived, and 3 trees did not survive. Find the survival rate.
同学们植树，成活397棵，3棵没成活，求成活率．
<gadget id="calculator">397 + 3</gadget>
<output>400</output>

<gadget id="calculator">397 / 400</gadget>
<output>397/400 = around 0.9925</output>

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

<gadget id="calculator">(397/400) * 1</gadget>
<output>397/400 = around 0.9925</output>

<result>397/400 = around 0.9925</result>