premise: Company B ( a very small company ) trades in a shopping centre but is not set up to take payments by credit cards . Company A agreed to provide the facility of its credit card machine for Company B ( Company A is not trading at present but has the machine ) . The machine print - outs still show Company A 's name , and the card payments go into Company A 's bank account and then are drawn out and passed to Company B. Company B will pay Company A 3 % of the intakes for the service . What may have caused Company B to lose 3 % of their sales ?
hypothesis: There is a flat 3 % fee for taking payments by credit cards .