Please double check I read the question correctly

For the following problem

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Land is bought for $45000 with buying expenses of $2180, and interest rate is 9% p.a. The land is kept for 4 years with annual costs of $500, and sold for $105000 at the end of the 4th year (selling expenses are $5000).

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I assume that the the cash flow time line is

-45000,-500,-500,-500,99500

Since I assume the annual costs come at the end of each year.

Just missed a little detail

The cash flow timeline is almost correct. However, for year 0, the buying expenses shouldn't have been neglected.

The timeline should be:

Year 0: -45000 - 2180 = -47180

Year 1: -500

Year 2: -500

Year 3: -500

Year 4: -500 + 105000 - 5000 = 99500