18-2-203. Amount and terms of security. The security mentioned in 18-2-201 must be in an amount equal to the full contract price agreed to be paid for the work or improvement and must be to the state of Montana, except in cases of cities and towns, in which case the municipality may by general ordinance fix and determine the amount of the security and the name of the secured party, provided that the amount may not be for less than 25% of the contract price of the improvement, and the security may designate that the amount is payable to the city or town and not to the state of Montana.