If the straight-line depreciation method is used, the annual average investment amount used in calculating rate of return is calculated as (beginning book value + ending book value)/useful life.

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?