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.
A2 : 1
B3 : 4
C4 : 3
D1 : 2
