To fund the construction of a new water treatment plant, the City of Lake Woebegone will sell general obligation bonds. The face value of each of the bonds is $1,000. The associated bond interest rate (coupon rate) is 4% per year paid annually. Approximately how many of these bonds will they have to sell to raise the necessary $2,500,000? Assume that the effective market discount rate is 8% and the bonds mature in 10 years? Ignore any influence of taxes and inflation.