Percent of a Fraction of a Number

If $20%$ of $\frac{1}{8}$ of a number $N$ is $7$, what is $2.5%$ of $\frac{1}{5}$ of $N$? The answer is in the form $\frac{\alpha}{\beta}$ where $\alpha$ and $\beta$ are coprime positive integers. Input the value of $\alpha + \beta$.