The survival rate of a batch of peanut seeds is 80% to 90%. To ensure the survival of 3600 peanuts, at least how many seeds must be planted.
一批花生种子的成活率是80%～90%．现要保证3600棵花生成活，至少要种下多少粒种子．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3_600 / (4/5)</gadget>
<output>4_500</output>

<result>4_500</result>