4) (25 pts) Consider the annuity problem below. The equation related to the problem is: Let P - P(1+-1]P[1-(1+)-] $1000, Po S(N1+2)*1000, N. (N1+1)*7 years, and N (N1+1)*3 years. Find the yearly interest rate r up to 4 digit accuracy using Secant method with r 0.025 and r 0.03 as initial guesses. If N1 0 take it to be 1.