To solve anything for tax, you can do it in one step, or 2 steps. To solve it in one step, simply put the tax amount into a decimal, with a one in front. So for this question, you would put 1.10 and multiply by the amount. So 30x1.10=$33. Or you can just multiply 30 by a decimal with a 0. So 0.10x30=3. Then add the 3 to 30
1 cup is equal to 8 oz, so 3 cups x 8 = 24 oz. you'll do the same for the two cups 2 x 8 = 16 oz so adding them all together will be 24 + 6 + 16 + 9 = 55 total oz.