why does fixed costs remain the same in total dollar amount but increases per unit as the level of activity changes

As the level of activity increases, how will a mixed cost in total and per unit behave? A) B) (C) D) E) In Total Increase Increase Increase Decrease Decrease Multiple Choice Choice A Choice B Choice C Choice D Per Unit Decrease Increase No effect Increase No effect

Within a relevant range, fixed costs per unit: Group of answer choices Decrease as the level of activity decreases. Decrease as the level of activity increases. Increase as the level of activity increases. Remain the same as the level of activity increases.