The manager of company $A$ is thinking about adding an air conditioner to the office. The AC will cost $$1160$ to buy and install. The manager plans to use the $AC$ for $5$ years and each year's depreciation rate is $15\%$ of the purchase price. The manager expects to sell the $AC$ in $5$ years for $$840.$ The tax rate is $35\%$ and the company's WACC is $8\%.$ If the manager considers this purchase of $AC$ as an investment, what is the NPV $($keep two decimal places and assume that the AC will not affect the operations of the company$)?$ I got $-427\mathrm{.}199$ and $-531\mathrm{.}992$ and both are wrong i dont know what i did please help