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Work out the percentage composition of c...

Work out the percentage composition of constituents elements in the following compounds:
Macrocosmic salt - Sodium ammonium hydrogen phosphate tetrahydrate `(NaNh_4HPO_4*4H_2O)`
(At. ,ass : Pb = 207, P = 31, O = 16, K = 39, Cr =52, Na =23, N=14)

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