cameroon gce advanced level 2025 building construction project management 3
cameroon gce advanced level 2025 building construction project management 3
Question 1: Machine Cost and Operation
A site machine was bought for 650,000 FCFA.
Evaluation
- Yearly Amortization Rate: 35% of the cost price.
- Maintenance: 20% of the cost price yearly.
- Working Days: 240 days per year.
Calculations:
- i. Annual cost of depreciation: 0.35 * 650,000 = 227,500 FCFA
- ii. Annual cost of maintenance: 0.20 * 650,000 = 130,000 FCFA
- iii. Annual cost of the machine: 227,500 + 130,000 = 357,500 FCFA
- iv. Daily rent of the machine: 357,500 / 240 = 1,489.58 FCFA
Further Calculations
The machine works for 2160 hours per year.
- Fuel Consumption: 12 liters of fuel and 1 liter of oil per day.
- Transportation and Installation: 40,000 FCFA.
- Operator’s Salary: 2,500 FCFA per hour.
- Fuel/Oil Cost: 700 FCFA per liter.
- Installation Cost: 3,000 FCFA.
Calculations:
- i. Cost of fuel per year:
- Working days per year: 2160 hours / (8 hours/day) = 270 days.
- Fuel cost per day: 12 liters/day * 700 FCFA/liter = 8,400 FCFA/day.
- Annual fuel cost: 8,400 FCFA/day * 270 days = 2,268,000 FCFA.
- ii. Cost of oil per year:
- Oil cost per day: 1 liter/day * 700 FCFA/liter = 700 FCFA/day.
- Annual oil cost: 700 FCFA/day * 270 days = 189,000 FCFA.
- iii. Salary of the operator per year: 2,160 hours * 2,500 FCFA/hour = 5,400,000 FCFA.
- iv. Total expenditure:
- Annual machine cost: 357,500 FCFA
- Annual fuel cost: 2,268,000 FCFA
- Annual oil cost: 189,000 FCFA
- Operator’s salary: 5,400,000 FCFA
- Transportation and installation: 40,000 FCFA
- Total: 357,500 + 2,268,000 + 189,000 + 5,400,000 + 40,000 = 8,254,500 FCFA
- v. Hourly expenditure: 8,254,500 FCFA / 2160 hours = 3,821.53 FCFA/hour.
Question 2: Concreting Project
- Volume of concrete: 640 m$$^3$$
- Floor slab area: 1386 m$$^2$$
- Concrete mix ratios: 350, 500, 500/750, 1000/500
- Working Day: 8 hours
- Mixing Cycle: 3 minutes
- Reduction due to compaction: 7.5%
- Crane: Can cover 1386 m$$^2$$. Equipped with a skip bucket of 0.5 m$$^3$$ and can do 30 rotations in an hour.
Requested Calculations:
- a) Choose the concrete mixer for this project: The provided data doesn’t contain information on mixer sizes, only the mix ratios. The choice would depend on the volume of concrete to be mixed per batch, which isn’t given. A standard mixer that can handle the required volume and mix ratios would be suitable.
- b) Determine the radius of the crane:
- Area = $\pi$$r$$^2$
- 1386 = $\pi$$r$$^2$
- r$$^2$$ = 1386 /
- r =
- r = 21 m
- c) Calculate the quantity of concrete produced per hour:
- Volume per cycle = 0.5 m$$^3$$
- Cycles per hour = 30 rotations
- Volume per hour (theoretical) = 0.5 m$$^3$$/rotation * 30 rotations/hour = 15 m$$^3$$/hour
- Volume per hour (actual) = 15 m$$^3$$/hour * (1 – 0.075) = 13.875 m$$^3$$/hour
- d) Calculate the quantity of cast concrete per hour:
- Assuming the rate of casting is the same as the production rate, the quantity of cast concrete is 13.875 m$$^3$$/hour.
- e) Determine the duration of the project in days:
- Total volume of concrete = 640 m$$^3$$
- Hourly production rate = 13.875 m$$^3$$/hour
- Total hours = 640 m$$^3$$ / 13.875 m$$^3$$/hour = 46.13 hours
- Working hours per day = 8 hours
- Total days = 46.13 hours / 8 hours/day = 5.77 days
- f) Give two ways to reduce the duration of the project:
- Increase the number of working hours per day: Working more hours daily will complete the project faster.
- Increase the number of concrete mixers/cranes: Adding more equipment will increase the rate of concrete production and casting, reducing the total time.
- g) Determine the duration of the project if the working day is extended by an hour:
- New working day length = 8 + 1 = 9 hours
- Total hours = 46.13 hours
- Total days = 46.13 hours / 9 hours/day = 5.13 days
