For the first $250 of services or product the donation should be 10% of the cost or services rendered.

$250 - $1000: a fixed fee of $25

$1000 - $5000:  a fixed fee of $50

Over $5000: a fixed fee of $100

Possible Scenarios

Percentage of a day's proceeds

A restaurant wants to donate a percentage of a day's proceeds to a church charity. The church would advertise to its congregation using small slips of paper to visit this establishment. Each slip of paper would be stapled to the meal receipt and a percentage of all proceeds would be donated to the church's charity.

Continuous service

A pool service or landscaping service charging a monthly fee for ongoing maintenance could make a donation based on a 1 year contract.

Service calls

Joe the Plumber wants to provide plumbing services to a new customer and has a great deal of competition. His ad could mention that he will donate more than the minimum recommended.

Product Sales by Consumers

Someone might be selling a car and would be willing to donate the minimum donation depending on the price.

Bids for a large contract

If you bid out a remodel job and award the contract to the lowest bidder who is part of this web site.  If the contract is over $5000 you would get a minimum donation of $100 or more depending on the agreements made.