I have a running time complexity of a function as below:
T(n)=$\frac{3}{5}$T($\frac{3n}{5}$)+$\frac{c}{n}$ for n>1
I see that we cannot apply Masters theorem directly as it is not in the desired form (a=$\frac{3}{5}$ which is less than 1). Is there any way to apply Masters theorem or what are the methods I can use to find the tight bound of the function. I tried using induction but couldn't find a proper series.