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John finances his daughter's college education by making deposits into a fund earning interest at an annual effective rate of 1.15\%. For 18 years he deposits x at the beginning of each month. In the 15th through the 19th years, he makes a withdrowal of 15,000 at the beginning of each year. The final withdrowal reduces the fund balance to zero. Calculate . 270 300 320 340 350