Answer:
401/99 and 802/198
Explanation:
Unfortunately the other answer to this question is wrong - you are looking for something equivalent to 4.0505050505050505, not just 4.05.
Typing the answer suggestions into a calculator you get:
405/99 = 4.0909090909 which is incorrect
401/99 = 4.0505050505 which is correct
81/33 = 2.45454545455 which is incorrect
802/198 = 4.0505050505 which is correct
405/100 = 4.05 which is incorrect as it doesn't repeat.
Hopefully this helps, let me know if you have any questions :)