Afactory employs 3 full-time workers and 6 part-time workers; the amount earned by each is:

£36,000 for the production supervisor;
£27,000 for the machine operator;
£21,000 for the general assistant;
a total of £50,000 for part-time staff.

how much was the wage bill for the 3 full-time staff?
£

what is the total wage bill?
£

how much less in total, do the part-time staff earn than the full-time staff?
£