It has been long time since I last reviewed the material.

but I don't remember the expenditure being weighted, why would the expenditure be weighted ?

It is from take home test. I do not have any more information.

What is the correct answer? Where did you get the question from? Is it in Wiley? Are there any explanations?

Give us some more info , so we cah help you :) Right now I don't have a clue how you weight these expenditures. (I did it by dates, but does not work)

same here... i would love to know the correct answer and how it was arrived at !

taxygood, do let us know what solution your tutor provides u.