Job, Batch & Service costing

Dear Sir,

Hope you’re fine.

I having confusion with a problem, so I need your kind help.

Q: The following figures relate to 2 electricity supply companies.

Co. A Co. B
Total Cost ($000): 600 1000
Units Sold (millions) 2880 9600
No. of consumers (thousands) 800 1600
Sales of electricity (millions) $ 18 $ 50

The correct answer stated that Co. A is less efficient than Co. B.

Ok, here’s my main problem:

A: The explanation to this question:

Co. A Co. B
Cost per: $ $

Millions of units sold 208 104
Thousand consumers 750 625
$ m of sales 33,333 20,000

Sir, I want to know how the following figures were calculated which resulted into the figures above. Pls pls pls help me with the calculation.

Thanks in advance.