A company has set 5 units per hour as the standard output, each unit having a piece rate of Rs. 3. In a normal day of 8 hours, X produces 35 units and Y produces 50 units. The usual hourly rate applicable to all workers is Rs. 15. Find out the earnings of X and Y:

(a) If only time-rate system is used

(b) If only piece-rate system is used

(c) If piece rate with guaranteed time rate is applied.