1: Following are some of the details of Service Industries Limited. Normal rate per hour = Rs 180 Standard time per unit = 20 seconds Differentials to be applied: 80% of piece rate below standard 120% of piece rate at or above standard Workers Ahmad, Bilal and Kamal produced 1,100, 1440 and 2180 units respectively per day of 8 hours. Calculate the earnings of workers Ahmad, Bilal and Chand under: 1: Straight piece-rate with guaranteed time rates. 2: Taylor's differential piece-rate system