Consider the following business models:

1.Service provider charges:

(A) All costs of labor + (B) all costs of materials + set flat percentage of A+B

2.Service provider charges:x% on first $1,000,0000, .85x on next 3,000,000, .70x on next 4,000,000, .5x on all amounts thereafter

3.Retailer charges: cost of good + 100% - promotional reduction between 30% and 75% of full price

4.Procurement Agent charges public: cost of services/goods plus 5-10%

5.Procurement Agent in number 4 charges the same for public but charges related businesses: cost of services/goods plus 20-50%.

6.Procurement Agent (different from 4 & 5 above) only services related businesses and charges: cost of services/goods plus 20-50%.

For each model explain if it is appropriate from a general perspective and from an ethical perspective.