I'm having trouble I'm having trouble with my homework it seems that the answer is incorrect but I've done the formula as it should be...

1st Question: Bramble Oil Company is considering investing in a new oil well. It is expected that the oil well will increase annual revenues by $144,348 and will increase annual expenses by $84,000 including depreciation. The oil well will cost $419,000 and will have a $9,000 salvage value at the end of its 10-year useful life. Calculate the annual rate of return.

Annual rate of return= Expected Annual Income/Average Investment

(144,348-84,000)/(419,000+9,000)/2 =60,438/214,000 =0.28

Also Have Trouble With This Question As Well Did A Whole Sheet For This & Still Got It Wrong??

2nd Question: Riverbed Inc. manufactures snowsuits. Riverbed is considering purchasing a new sewing machine at a cost of $2.45 million. Its existing machine was purchased five years ago at a price of $1.8 million; six months ago, Riverbed spent $55,000 to keep it operational. The existing sewing machine can be sold today for $242,828. The new sewing machine would require a one-time, $85,000 training cost. Operating costs would decrease by the following amounts for years 1 to 7:

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