From the following information, calculate the earnings of three workers X, Y, and Z under Gantt’s task bonus plan.

(a) Time rate : Rs. 15 per hour

(b) High task per day of 8 hours: 80 units

(c) High piece rate = Rs. 2 per unit

(d) Day’s output: X = 70 units; Y = 80 units; Z = 90 units