r₁

n₁

r₂

n₂

r₃

n₃

r₄

n₄

Profit (£)

Offer

5

6

1

5

6

7

6

7

30.9381

5%

5

6

2

5

6

7

6

7

45.5365

20%

5

6

3

5

6

7

6

7

68.3430

20%

5

6

4

5

6

7

6

7

91.1750

20%

5

6

5

5

6

7

6

7

114.0324

20%