cnt photo it in the book, but this is what i did
i found A60 without the inhertience of 1500 by subbing 60 into the formula in i) and the answer came out to be quite large
then For A3, subbed 3 into the formula in i) and subtracted an extra $1500 which reduced the amount for a3 to 21421$, but i dont get where to go from here:/