How to Implement the below scenarios in BPA?

Summary:

We would like to implement the below scenarios in BPA

1. Create a BPA line for accomodation cost per person per night. For example for each person the rent is 200$. So if 3 person are staying for 3 nights then the cost will be 200*3*3 = 1800$
2. Create a BPA line for transportation cost where for first 50 km the rate is constant and after 50 km it is 1 $ for every km. For example if total km is 70 then total cost would be 500 $ (Fixed rate for first 50 km) + 20 (20*1) $ = 520 $

How to achieve this?

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