Twenty-five per cent of the compensation paid under section 124.15 or 124.152 of the Revised Code to a person designated as a chaplain or religious services administrator, while serving in a full-time capacity in such position, shall be considered to be a housing allowance. The amount of the housing allowance shall not affect the requirement of section 145.47 of the Revised Code as to the contribution to be made to the employees’ savings fund of the public employees retirement system, and the amount of the contributions shall be based on the member’s earnable salary, including the housing allowance.