Here, d1=45 cm and d2=30 cm
Area of one title = 12d1d2=12×45×30=675 cm2
∴ Area of 3000 tiles = 675×3000=2025000 cm2
= 202500010000=202.50 m2 [1m2=10000cm2]
Cost of polishing the floor per sq.meter = Rs 4
∴ Cost of polishing the floor of 202.50 sq.meter = 4×202.50=Rs810
Hence the total cost of polishing the floor is Rs 810