Holdtight Company Ltd have just received orders from four customers for quantities of different 'expanderbolts'. Each order is to be manufactured over the same very short period of time, during which three machines are available for the manufacture of the bolts.

The table below shows the manufacturing time in hours/bolt for each of the three machines and the total available hours' capacity on each for the period in question.

Manufacturing time (hours/bolt)

Order no.	Number of expanderbolts	M/cA	M/cB	M/cC
1	50	4	5	3
2	75	3	2	4
3	25	5	4	3
4	80	2	5	4
Total capacity (hours)		175	275	175

Assuming that each order is to be manufactured on one machine only, how should orders be allocated to machines?