The county treasurer shall keep in his office a record showing the date and aggregate amount received by him daily on account of each class of funds designated in Section 3-11003, and also his accounts with each depository, which accounts shall show daily the date and amount of each deposit, the date and amount of each withdrawal, and the balance on deposit. Each such account shall also show the date and amount of each interest payment received by or credited to the county treasurer and the rate of interest at which such payment was computed. Said record and all contracts with depositories shall be open to the inspection of all persons wishing to examine the same.