A physical quantity X is related to four measurable quantities a, b, c and d as follows:

X = a^{2} b^{3} c^{5/2} d^{-2} .

The percentage error in the measurement of a, b, c and d are 1%, 2%, 3% and 4%, respectively. What is the percentage error in quantity X ? If the value of X calculated on the basis of the above relation is 2.763, to what value should you round off the result.