Sources of Income

Q: An employment agency fee structure is as follows: As long as the employee works for the employer the agency will receive a percentage. Is this correct?

Q: For rotating money in the business, one person will be collecting a fixed amount from the 10 persons for the 11 months (including himself). Each month he will gather the entire amount and for the first month he will take the entire amount himself. For the remaining months, whoevers turn its is will take whole collected amount and the first person will take a small amount of commission (fixed amount) as the maintenance charge of this system. Is this system allowed in Islam? Is the commission amount interest?