2. The shift time is 8 hours. Given that the worker cycle time is 2.3 min and his performance rate is 105%, machine cycle time 3 min, the allowance factor is 17%. Workers' work elements are internal (overlapping). Determine: a) how many units the worker can produce per day under Am=22%; b) if the worker produces 1.1 Qstd, what is the worker's efficiency