Copper consists of two isotopes A and B, whose atomic masses are 62.93 amu and 64.93 amu respectively. The atomic mass of copper is 63.55 amu. Calculate the percentage of the isotopes A and B.
1
A (51%) & B (49 %)
2
A (60%) & B (40 %)
3
A (69%) & B (31%)
4
A (1%) & B (99 %)