Prepare Interim Certificate No. 3 in the prescribed format. Calculate the payment due to the main contractor for that particular month. You must show detailed workings, where necessary. Works completed to date

Variation works (Nett addition) $ 100,000 Reinforced concrete work $ 150,000 Structural steelwork $ 300,000 Sanitary and plumbing works $ 30,000 Other information Contract sum $ 5,000,000 Deposit paid to supplier $ 20,000 Pest control services $ 2,500 Rental of vehicles for site staff $ 15,000 Total payment paid to main contractor $ 200,000 Materials delivered to site $ 50,000 Material ordered but not delivered to site $ 80,000 Limit of retention 5% of Contract sum

Retention for work done As per Public Sector Standard Conditions of Contract (PSSCOC) under the building and construction Authority (BCA) Singapore Retention for unfixed material As per PSSCOC