A physical quantity P is related to four observations a , b , c and d as follows: P = a 3 b 2 c d The percentage errors of measurement in a , b , c and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity P is

1. A. 15%
2. B. 10%
3. C. 2%
4. D. 13%

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