Be sure to use a cup big enough to hold at least 1 1/2 cups of water. Add the sugar, flour, salt, and cocoa to the cup and mix. Add oil and water and mix the dry and wet ingredients together thoroughly. Microwave on high for 1 minute and 15 seconds. You may have to microwave it longer or shorter, depending on your microwave, but the brownie should still be wet in the center when done. This makes a fudgy brownie.