Since Henry Ford first adapted the conveyor belts of grain factories to create an assembly line, there have been several modifications of that basic concept, each of which has made it possible for today’s manufacturers to produce goods from spaceships to cotton balls. Identify four significant new manufacturing process that rely on new technologies and the manufacturing subsectors they affect, and discuss at least one specific application in manufacturing for each technology. must be 150 words

"jake’s roof repair has provided the following data concerning its costs: fixed cost per month cost per repair-hour wages and salaries $ 20,900 $ 15.00 parts and supplies $ 7.70 equipment depreciation $ 2,800 $ 0.35 truck operating expenses $ 5,720 $ 1.60 rent $ 4,690 administrative expenses $ 3,850 $ 0.50 for example, wages and salaries should be $20,900 plus $15.00 per repair-hour. the company expected to work 2,600 repair-hours in may, but actually worked 2,500 repair-hours. the company expects its sales to be $47.00 per repair-hour. required: compute the company’s activity variances for may."