Payback & ARR - self-test questions

Why not have a go at the following examples to see how well you have understood the calculation of payback and ARR?
A firm has to choose between two possible projects and the details of each project are as follows:
| Capital cost
|
$000
|
| Project A
|
300
|
| Project B
|
500
|
| Project C
|
450
|
| Net cash inflow ($000)
|
|
|
|
|
Project A
|
Project B
|
Project C
|
| Year 1
|
75
|
100
|
50
|
| Year 2
|
125
|
200
|
75
|
| Year 3
|
125
|
300
|
250
|
| Year 4
|
100
|
300
|
300
|
| Year 5
|
75
|
150
|
200
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|