In order to calculate how much water it will take to fill the pan we need to calculate it's volume. Since the bottom is circular, then the pan have a cylinder format and it's volume can be calculated by:
volume = pi*r²*h
The radius of the circle is the diameter divided by two.
Answer is $924. First you must multiply 1200 by .3 for the sales tax. Giving you 360. You subtract 360 from 1200 giving you 840. Then you multiple 840 by .1 which gives you 84. You then add 84 to 840 giving you $924.