Given the formula for future value annuity: FV of annuity=P[(1+r)^n-1]/r where: P=principle r=rate n=time the time taken to repay the loan will be: 1500=90[(1+0.06)^n-1]/0.06 90=90[(1+0.06)^n-1] 1=(1+0.06)^n-1 1+1=(1+0.06)^n 2=1.06^n introduce natural log ln2=nln1.06 n=ln2/ln1.06 n=11.8957=12 years the answer is 12 years.