I. The board shall keep an accurate record of its cost of operation, including the salaries and expenses of the board and board personnel, and shall determine the portion thereof attributable to each condemnor having proceedings before the board. II. Subsequent to any board action, the board shall bill to and collect from each of the condemnors the amount attributable to each, except the department of transportation for proceedings involving land purchases utilizing highway funds. III. Funds collected pursuant to paragraph II shall be disposed of as follows: (a) There shall be transferred to the highway fund the sum, if any, remaining after the amount of the board's expenses attributable to proceedings involving land purchases utilizing highway funds is subtracted from the total amount transferred from the highway fund for the use of the board; (b) Any balance remaining after the transfer provided for in subparagraph (a) above shall be deposited in the general fund. IV. In the event the expenses of the board attributable to proceedings involving land purchases utilizing highway funds exceed the amount appropriated from highway funds for the expenses of the board, such excess shall be transferred from the highway fund to the general fund and all funds collected pursuant to paragraph II shall be deposited in the general fund.