If the fractional recovery at each step of unit operation

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If the fractional recovery at each step of unit operation is 0.8, the recovery after 4 steps will be

1. 0.24
2. 3.23
3. 0.41
4. 0.82

Correct Option: C

The recovery after four steps
= (0.8)⁴ = 0.4096 ≃ 0.41