The income of Shyam is 20% less than the income of Ram. The income of Radha is 25% less than the combined income of Ram and Shyam. The income of Sita is 25% more than the combined income of Ram and Shyam. Find the ratio of the combined income of Ram and Shyam to the combined income of Sita and Radha.
1
2 : 1
2
3 : 4
3
4 : 3
4
1 : 2
5
None of the above