Concept:Future value of an annuity and surplus calculation.Explanation:The company deposits ₹45,000 at the end of each year for 9 years into an account earning 6% p.a.The future value of an ordinary annuity is given by:FV=P×r(1+r)n−1where P=45000, r=0.06, and n=9.Compute (1.06)9=1.689478958Then 0.061.689478958−1=0.060.689478958=11.49131597Multiply by P: 45000×11.49131597=517109.22The debenture amount is ₹5,00,000.Surplus = 517109.22−500000=₹17,109.22≈₹17,109.Answer:₹17,109.