Determine the value of the equilibrium constant for reaction

Question

Based on the equilibrium constant values for the following reactions:

Cd(NH_3)₄^{2+ (aq)} <->Cd²⁺ (aq) + 4 NH₃ (aq) K=1.0x10^-7

CdS (s) <-> Cd²⁺ (aq) + s^2-(aq)   K= 3.6x 10^-29

Determine the value of the equilibrium constant for the reaction

CdS (s) + 4 NH₃ (aq) <-> Cd(NH₃)₄²⁺ (aq) + S²⁺(aq)