For the purpose of purchasing schoolhouse sites, erecting schoolhouses, library buildings and furnishing the same and building additions to, or repairing old buildings, the board of education in metropolitan districts may borrow money and issue bonds for the payment thereof in the manner herein provided. The question of the loan shall be decided at an election. Notice of the submission of the question shall include the amount of the loan required and for what purpose.
§ 164.141, RSMo