r₁

n₁

r₂

n₂

r₃

n₃

Profit (£)

Offer

4

11

3

7

0 - 9

13

4.9934

10%

4

11

3

7

10

13

5.3483

15%

4

11

3

7

11

13

5.8748

15%

4

11

3

7

12

13

6.4076

15%

4

11

3

7

13

13

6.9412

10%