A physical quantity \(Q\) is related to four observables \(a, b, c, d\) as follows:
\( Q = \dfrac{ab^{4}}{cd} \)
Where, \( a = (60 \pm 3)\, \text{Pa} \); \( b = (20 \pm 0.1)\, \text{m} \); \( c = (40 \pm 0.2)\, \text{N s m}^{-2} \) and \( d = (50 \pm 0.1)\, \text{m} \), then the percentage error in \(Q\) is \( \dfrac{x}{1000} \), where \( x = \) ___________.
