Units And Measurement

A physical quantity $P$ is related to four observations $a, b, c$ and $d$ as follows:

\(P=a^3 b^2 / c \sqrt{d}\)

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