sorta stuck...

There are two standard wasy to do this. 

the GP way is not the easiest but if that is what you think is wanted then lets take a look.

$0.23\bar{72}\\ =0.23 + 0.0072+0.000072 + \dots\\ consider \\ 0.0072+0.000072 + \dots\\ \text{This is a GP}\\ a=0.0072,\quad r=0.01\\ S_\infty=\frac{a}{1-r}\\ S_\infty=\frac{0.0072}{0.99}\\ S_\infty=\frac{72}{9900}=\frac{8}{1100}\\~\\ 0.23\bar{72}=\frac{23}{100}+\frac{8}{1100}=\frac{253+8}{1100}=\frac{261}{1100}$

You need to check my working.