Answer:
Return on investment after the purchase of the new machine: 24.57%
Explanation:
Old machines: 57,000
New machine: 100,000
controllable margin (operating income): 100,000
operating assets: 600,000
less old machines (57,000)
add new machines 100,000
assets after purchase: 643,000
ROI: operating income/ assets
158,000 / 643,000 = 0,2457231726283 = 24.57%