Each registration agent may charge an applicant not more than $3, $.50 of which is to recover local production and administrative costs, that shall be in addition to the fees otherwise required to issue, renew, or transfer a motor vehicle registration. The remaining $2.50 of this fee shall be retained either by the municipality if the registration agent receiving the fee is on salary to the municipality, or by the agent if the agent is not on salary to the municipality but is paid on a fee basis.