jmc

The five decimals sum to $0.12345$, which as a fraction is $\frac{12,345}{100,000}$. Since $100,000=2^5\cdot 5^5$, we only have to cancel factors of 2 or 5 from $12,345$. Since $12,345$ is odd, it has no factors of 2. Dividing by 5, we find that $\frac{12,345}{100,000}=\boxed{\frac{2469}{20,000}}$.