Fixed costs may change from one year to the next. For example, if the total rental fee of the two trucks is increased by $2,000 for 2012, the total level of fixed costs will increase to $82,000 (all else remaining the same). if that increase occurs, total rental costs will be fixed at this new level of $82,000 for 2012 for miles hauled in the 120,001 to 240,000 range.