The formula of the present value of annuity ordinary is Pv=pmt [(1-(1+r/k)^(-kn))÷(r/k)] Pv present value 1200000 PMT semiannual payment 75000 R interest rate 0.0635 K compounded semiannual 2 N time? 1200000=75000[(1-(1+0.0635/2)^(-2n))÷(0.0635/2)] Solve for n 1,200,000÷75,000=[(1-(1+0.0635/2)^(-2n))÷(0.0635/2)]