An element (A) has 5 isotopes. The masses (and abundances) of the isotopes 46A, 47A, 48A, 50A are 4595263 u (7.25 %), 46.9518 u (6.44 %), 47.9479 u (63.72 %), and 49.9448 u (5.18 %) respectively. If the element A
has an atomic mass of 47.87 u, and the last isotope 49A has a percent abundance in the ratio of 3.361 that of SA, what is the mass of 49A?

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