The answer is $962.09. All you do is multiply 890$ by your tax and than add your tax. Another way of doing it is take the decimal value of your 8.1% which is .081 and add 1 to get 1.081. Now that you have that you multiply 890 by 1.081 to get 962.09
If he cut the loaf into equal pieces, then told you 1/3 was left you could check the even multiples of three. Such as six. So he could have 2 pieces left of his loaf if he cut them into six pieces because 1/3 = 2/6
