You and your best friend want to take a vacation to peru.  you have done some research and discovered that it will cost $2400 for the plane tickets, all-inclusive hotel and resort, and souvenirs.  you have already saved $1750.  if you invest this money in a savings account with a 2.3% interest rate compounded annually, how long will it take to earn enough money to go on the trip?   use the compound interest formula a = p (1 + i)n, where a is the accumulated amount, p is the principal, i is the interest rate per year, and n is the number of years. round your final answer to the nearest tenth