The following particulars are obtained from the records of a factory:

Materials issued

1,28,000

Wages paid

1,12,000

Factory overheads

60% of wages

Materials returned to stores:

1,600

Materials transferred to other jobs:

800

10% of the production has been scrapped as bad and a further 20% has been brought up to the specification by increasing the factory overheads to 80% of wages. If the scrapped production fetches only Rs. 940, find the production cost per unit if the finished product of the total production (including the quantity scrapped) is 100 units.