r₁

n₁

r₂

n₂

r₃

n₃

Profit (£)

Offer

1

5

6

11

3

4

3.4935

15%

2

5

6

11

3

4

7.8071

15%

3

5

6

11

3

4

13.1930

15%

4

5

6

11

3

4

19.9823

15%

5

5

6

11

3

4

28.6029

15%