EXERCISE 10-17
(a) Controllable margin = ($3,000,000 – $1,980,000 – $600,000) = $420,000
ROI = $420,000 ÷ $5,000,000 = 8.4%
(b) 1. Contribution margin percentage is 34%, or ($1,020,000 ÷ $3,000,000)
Increase in controllable margin = $320,000 X 34% = $108,800
EXERCISE 10-18
(a)
DINKLE AND FRIZELL DENTAL CLINIC
Preventive Services
Responsibility Report
For the Month Ended May 31, 2014
Difference
Favorable F
Unfavorable U
Total controllable fixed costs
*Average investment = ($82,400 + $77,600) ÷ 2 = $80,000