The territory over which the library commission in any city having a population of more than 250,000 shall conduct the activities to it by law confided, and to which shall apply charges and obligations heretofore or hereafter imposed for the purposes of any said commission, shall be co-extensive with the boundaries of any said city and shall automatically change by and with any change in said boundaries.

     The annual budget of any said commission shall be prepared in manner and time provided by the charter of any said city concerning the budget thereof and shall be submitted to and passed upon by the officers and boards of any said city as are the items in the budget thereof.

     The fiscal year of any said commission shall be identical with that of any said city.

     The relation of officers or agencies of any said city to the affairs of any said commission growing out of any special or local act of the state legislature shall continue in officers or agencies of any said city on revision or amendment of said special or local act by the electors of any said city.

     All payrolls, bills, accounts and claims of every character against the library commission after having been duly audited and approved by the commission, the certificate of which audit and approval shall be endorsed thereon by the president or secretary of the commission or some member or other representative of the commission acting under authority conferred by the commission generally or specially, shall be transmitted to the city controller, who shall endorse thereon his approval or disapproval. When so endorsed with approval the controller shall draw his warrant or warrants on the city treasurer in payment therefor. No bill, account or claim shall be audited or approved by the commission unless the same shall be accompanied by a certificate of a representative of the commission who acted for the commission in making the purchase or contract or in taking the delivery or performance that he verily believes the services or property therein charged have been actually performed or delivered for the commission, that the sum or sums charged therefor are reasonable and just, and that to the best of his knowledge and belief no setoff exists, nor payment has been made on account thereof except such as are included or referred to in such account. A similar certificate shall be required upon all payrolls, the certificate to be made by the person under whose supervision the services charged have been rendered. The provisions hereof shall be in addition to any provisions covering the same matters in any general or local act or charter adopted pursuant to Act No. 279 of the Public Acts of 1909, as amended, being sections 117.1 to 117.38 of the Compiled Laws of 1948.