1) A borrows Rs. 800 at the rate of 12% per annum simple interest and B borrows Rs. 910 at the rate of 10% per annum simple interest. In how many years will their amount of debt be equal ? A) 18 B) 20 C) 22 D) 24 E) 15 Answer: Option CExplanation:Let the period or time be N years Given, 800+800×12×N100 =910+910×10×N100 800+96N =91N+910 ⇒5N=110 ⇒1105 = 22 years.