Final answer:
The normal time for welding the truck doors is approximately 7.36 minutes and the standard time is approximately 7.14 minutes. The allowance factor for the welding operation is approximately 97%.
Step-by-step explanation:
The observed time for welding a part onto truck doors at Busan Cottenden was 8.1 minutes. The performance rating of the worker timed was estimated at 110%. According to the labor union contract, each welder is allowed 4 minutes of personal time per hour and 2 minutes of fatigue time per hour. There is also an allowance of 2 minutes per hour for delays. The normal time for this process can be calculated by dividing the observed time by the performance rating. Therefore, the normal time for this process is 8.1 minutes / 1.1 = 7.364 minutes (rounded to two decimal places).
The allowance factor for the welding operation can be calculated by summing up the personal time, fatigue time, and delay allowance, and then dividing it by the normal time. Therefore, the allowance factor = (4 + 2 + 2) / 7.364 = 0.970 (rounded to two decimal places or 97%).
The standard time for this process can be calculated by multiplying the normal time by the allowance factor. Therefore, the standard time = 7.364 minutes * 0.970 = 7.137 (rounded to two decimal places).