Table 4 indicates various cost associated with two different water pump brands. Table 4: Various cost for the two pumps. Description Pomac Grundfos Initial cost (RM) 4,000 10,300 Rebuilt cost (RM) 1,000 2,200 Time before rebuild, annually or minimum hours 2,000 8,000 Cost to operate, RM per hour 1.00 0.90 Life, years 3 6 (a) Determine the minimum number of hours per year to operate the pumps that will justify the Grundfos pump using Annual Worth method with interest rate of 10% annually, (16 marks) (b) Decide which pump is economically better if it operates 7 hours per day, 365 days per year. (9 marks) Table 4 indicates various cost associated with two different water pump brands. Table 4: Various cost for the two pumps. Description Pomac Grundfos Initial cost (RM) 4,000 10,300 Rebuilt cost (RM) 1,000 2,200 Time before rebuild, annually or minimum hours 2,000 8,000 Cost to operate, RM per hour 1.00 0.90 Life, years 3 6 (a) Determine the minimum number of hours per year to operate the pumps that will justify the Grundfos pump using Annual Worth method with interest rate of 10% annually, (16 marks) (b) Decide which pump is economically better if it operates 7 hours per day, 365 days per year. (9 marks)