1. Rent of a room is Rs. 9600, which is shared among Kallu, Malkhan, Ramu and Shyam. If contribution ratio of Kallu & Malkhan, Malkhan & Ramu and Ramu & Shyam is 1:2, 2:3 and 5:6 respectively, then what is the contribution of Malkhan in the rent?