Respuesta :
b. New shoe making machines are twice as efficient as older machines. is the correct answer. Hope this helps!
Answer:
New shoe making machines are twice as efficient as older machines.
Step-by-step explanation:
This option is correct because, firstly more capital will be needed to install new machine. And as these new machines are more efficient than the older ones, they will require less labor cost. The machines can work double than the older ones with less manpower. So, option B is correct.