$$x=0.2\dot{5}$$,  $$100x=25. \dot{5}$$,  $$10x=2. \dot{5}$$,  $$90x=23$$,  $$x= \frac{23}{90}$$. 
Express the recurring decimal~$0.2\dot{5}$~as a fraction. ． 
Options:
a. $$\frac{23}{99}$$ 
b. $$\frac{23}{90}$$ 
c. $$\frac{25}{99}$$ 
d. $$\frac{25}{90}$$ 