JEE Advanced 2018 Chemistry question

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is . (Atomic weights in g mol: H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)