Innards, One thing I found out recently is the wrong way of calculating rates for window blinds. I was enquiring rates for window blinds, for a window of size 1m x 1m. Several shops quoted a rate of 90 QAR per Sq m, which was fine. But the amount quoted was 180 QAR as they calculated the area of the window as 2 Sq M !! Wrong calculation. And they lost a deal!! Eventually I found a guy who could calculate properly! However, Check this before you finalize.