Can anybody help me with this complex equilibrium problem, please? I can’t solve it and I don’t know why…?

Calculate the concentration of Ag+ in a solution obtained dissolving 0.01 moles of AgNO3 and 0.1 moles of NH3 in 1 L of water. How do I do it? The answer is 8,91 x 10^-8, but i get 0.05. What am I doing wrong? Please someone help me out! The k is given as logβ2= 7.24

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