### general intelligence and reasoning for upsc exams

The syllabus of Staff Service Commission exam is the gerenal intelligence and reasoning, general awareness and general mathematics. From this I had some question models and I worked it also and I would like to share this with all. Because, I think it could be very useful to us. Let's go to the model questions.

1. If the compound interest of a sum for the first year at 4% per annum be Rs.50, what will be the compound interest at the same sum for 2 years at the same rate?

 Sol: Compound Interest for 1 year = Simple Interest for 1 year 50 = P X 4 X 1/100 (P is the Principle) P = 1250 n C.I. = P(1+r/100) – P 2 = 1250 (1+4/100) – 1250 = (1250 X 104/100 X 104/100) – 1250 = Rs. (1352-1250) = Rs. 102/-

2. What will be the compound interest of Rs.4000 at 20% p.a. for 1 ½

year, when compound interest is payable half yearly?

 Sol: Yearly interest = 20%, Half yearly interest = 10% Time = 1 ½ year = 3/2 X 2 half yearly = 3 half yearly n Amount = P(1+r/100) = 4000 X 11/10 X 11/10 X 11/10 = Rs. 5324/- C.I. = 5324 – 4000 = Rs. 1324/-