24. In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are 24 25 12 Mg (23.98504 u), 12 Mg (24.98584 u) and 26 12 Mg (25.98259 u). The natural abundance of Mg is 78.99% by mass. Calculate the abundances of other two isotopes