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  • Question

  • The population of a country is 100 crore and it is the possibility that the population will become 13.31 crore in 3 yr. What will be the annual rate percent on this growth?


  • Options
  • A. 8%
  • B. 12.7%
  • C. 10%
  • D. 15%

  • Correct Answer
  • 10% 

    Explanation

    Given, P = 10 crore
    and population after 3 yr = 13.31 crore
    According to the formula,
    Population after n yr = P (1 + R/100 )n
    ? 13.31 = 10 (1 + R/100 )3
    ? 1331/1000 = (1 + R/100 )3
    ? (11/10)3 = (1 + R/100 )3
    ? 1 + R/100 = 11/10
    ? R/100 = 11/10 - 1 = 1/10
    ? R = 10%

    • More questions

    • 1. The difference between simple interest and compound on Rs. 1200 for one year at 10% per annum reckoned half-yearly is

    • Options
    • A. Rs.2
    • B. Rs.3
    • C. Rs.4
    • D. Rs.5
      • Discuss
    • 2. What is the compound interest (in Rs) for 1 year on a sum of Rs 20000 at the rate of 40% per annum compounding half yearly?

    • Options
    • A. 8000
    • B. 8650
    • C. 8750
    • D. 8800
      • Discuss
    • 3. If 1st January 2013 was Wednesday, then what day of the week was it on 2nd January 2014?

    • Options
    • A. Wednesday
    • B. Thursday
    • C. Tuesday
    • D. Friday
      • Discuss
    • 4. The compound interest on Rs. 4000 for 4 years at 10% per annum will be

    • Options
    • A. Rs. 1856.40
    • B. Rs. 1600
    • C. Rs. 1856
    • D. Rs. 1756.60
      • Discuss
    • 5. If O is the orthocentre of a triangle ABC and ?BOC = 100°, the measure of ?BAC is

    • Options
    • A. 100°
    • B. 180°
    • C. 80°
    • D. 200°
      • Discuss
    • 6. Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 16000 for 2 years at 10% per annum. The sum placed on simple interest is:

    • Options
    • A. Rs 14000
    • B. Rs 3500
    • C. Rs 7000
    • D. Rs 5600
      • Discuss
    • 7. The ratio of milk and water in three samples is 1 : 3, 3 : 5 and 11 : 5. A mixture containing equal quantities of all three samples is made. What will be the ratio of milk and water in the new mixture?

    • Options
    • A. 7 : 9
    • B. 5 : 7
    • C. 15 : 13
    • D. 9 : 11
      • Discuss
    • 8. ABCD is a quadrilateral inscribed in a circle (radius = ). The bisectors of the angles DAB and BCD intersect the circle at X and Y, respectively. What is the length of the straight line XY?

    • Options
    • A. ? (rxr)
    • B. 2r
    • C. (r + 2)
    • D. ? (rxr)/2
      • Discuss
    • 9. The average weight of 10 parcels is 1.7 kg. Addition of another new parcel reduces the average weight by 60 gram. What is the weight , in kg, of the new parcel?

    • Options
    • A. 1.04
    • B. 1.08
    • C. 1.4
    • D. 1.8
      • Discuss
    • 10. The bankers discount and true discount on a sum of money due 8 months hence are Rs.120 & Rs.110 resp. Find the sum.

    • Options
    • A. 1457
    • B. 1320
    • C. 1140
    • D. 1260
      • Discuss

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