A sample of an element A contains two isotopes (A⁸¹⁶) and (A⁸¹⁸). If the average atomic mass of the element is (16.2 , amu), calculate the percentage of the two isotopes in this sample.
a) (40% , A⁸¹⁶, , 60% , A⁸¹⁸)
b) (45% , A⁸¹⁶, , 55% , A⁸¹⁸)
c) (50% , A⁸¹⁶, , 50% , A⁸¹⁸)
d) (55% , A⁸¹⁶, , 45% , A⁸¹⁸)
