A factory produces 500 units of a product in an 8 hrs shift. If each unit requires 20 minutes of processing time, what labour productivity ni unit per hours?

First, let's calculate the total processing time for 500 units:

Total processing time = 500 units * 20 minutes per unit = 10,000 minutes

Next, let's convert the total processing time to hours:

Total processing time in hours = 10,000 minutes / 60 minutes per hour = 166.67 hours

Now, let's calculate the labour productivity in units per hour:

Labour productivity = 500 units / 8 hours = 62.5 units per hour

Therefore, the labour productivity in units per hour is 62.5 units per hour.