The objective function for Y=(49.8 X1 + 249.7 X2 X3 X4 + 13110.5 + 624.3 + 12.4)/X1

X1, X2, X3, X4 boundary condition is:
The X1 values range 3000-5500
X2 value range 230-355
The X3 range 1600-2200
X4 values range 268-400

Work out the maximum and minimum of the objective function?
Dear great god answers, genuflect is begged