The rate of payment to be made by the county to any hospital or clinic for out-patient visits for county eligible patients certified in accordance with section 25-58 shall not exceed the actual cost to the hospital or clinic of such visit, as determined by a method of accounting approved by the state department of health for computation of such costs, or sixty dollars ($60.00) per visit, whichever is less; such payment to include all medical, surgical, laboratory, X-ray, drug and other costs and charges of every kind and description. If the cost of such visit is paid in part by the state, or any other governmental or charitable agency or other source, the county shall in no event pay more than the difference between the other payment and the actual cost or six dollars ($6.00), whichever is less. (Mont. Co. Code 1965, § 89-60.)