When any housing authority created for any city or county becomes authorized to transact business and exercise its powers, the governing body of the city or county shall immediately make an estimate of the amount necessary for the administrative expenses and overhead of the housing authority during its first year, and may appropriate the amount to the authority as a loan or donation. Any city or county located wholly or partially within the area of operation of a housing authority may lend or donate money to the authority or agree to do so. When it has money available, the housing authority shall make reimbursements for all such loans made to it.