Ram and Tiles

Ram is your friend. Ram is undergoing construction on his house, and he would like an estimate of the amount of money he would need to tile his rooms. Construction of Ram's house has begun and tiles are being installed at the moment. The Ram's House has $N$ rooms with a length of $X$ ft and a width of $Y$ ft. As a friend of Ram, your job is to estimate the amount of money Ram needs for tiling.