How much is the aluminum plate 30 30 ceiling in that kitchen and bathroom now? How is it calculated?

This depends on whether your local wage level is high, like our side, the ceiling is calculated by the square, 40 to more than 100, and the other is the deduction of the line by the meter of dozens of ranges, first of all, you have to determine what the material is good to use, how many square calculations, and then it is to find an installation master to give a little work, we are here for 300 days, I don't know how the price is over there, you are 900 square meters, if you install it according to two people may be about five days.