In a factory differential Piece rate system is used. The differential applied as follow:

75 percent of standard piece rate for the output below standard 120 percent of standard piece rate for the output above standard Standard output is 630 units per hour and standard wage rate is 950 dollars per hour. worker A produced 620 Units, worker B produced 640 Units, and worker C produced 660 Unit .Calculate the earnings of each worker under differential Rate system.