A hall floor measuring 20 m by 15 m is to be tiled. Tiles cost ₹75 per square metre, and 8% more tile area than the floor area must be bought to allow for cutting and breakage. What is the total cost of the tiles?

The floor is $20\times 15=300$ sq m, so the tile area purchased = $300\times 1.08=324$ sq m and the cost = $324\times 75$ = ₹24300. The trap ₹22500 prices the bare 300 sq m and ignores the wastage allowance; ₹20700 works out 8% and takes it away instead of adding it, pricing 276 sq m; ₹1800 is the cost of the 24 sq m of extra tile alone, which answers only part of the question.