Grandpa Wang planted 150 small trees on the hillside behind his hut last year. After a period of time, he found that 10 were dead, so he replanted 10 more, and all of them survived. What was the survival rate of the trees planted by Grandpa Wang last year?
王爷爷去年在自家小屋后面的山坡上种下150棵小树，过了一段时间发现枯死了10棵，于是又补种10棵，结果全部成活，王爷爷去年植树的成活率是多少？
<gadget id="calculator">150 - 10</gadget>
<output>140</output>

<gadget id="calculator">140 + 10</gadget>
<output>150</output>

<gadget id="calculator">150 + 10</gadget>
<output>160</output>

<gadget id="calculator">150 / 160</gadget>
<output>15/16 = around 0.9375</output>

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

<gadget id="calculator">(15/16) * 1</gadget>
<output>15/16 = around 0.9375</output>

<result>15/16 = around 0.9375</result>