In a magnesium sample, the only isotopes present are $^{24}\text{Mg}$, $^{25}\text{Mg}$ and $^{26}\text{Mg}$. The percentage abundance of $^{25}\text{Mg}$ and $^{26}\text{Mg}$ is equal. The relative atomic mass of magnesium in the sample is 24.3. What is the percentage abundance of $^{24}\text{Mg}$?
- A10%
- B20%
- C60%
- D80%