A salesman receives a commission for each sale he makes together with a fixed daily income. The number of sales he makes in a day along with their probabilities are given in the table below : X : 0, 1, 2, 3, 4, 5; P(X) : 0.42, 3k, 0.3, 0.05, 2k, 0.03. His daily income Y (in ₹) is given by : Y = 800X + 50