Advertisements
Advertisements
प्रश्न
The annual rate of growth in population of a town is 10%. If its present population is 26620, then the population 3 years ago was _________
Advertisements
उत्तर
₹ 20,000
Explanation;
Hint:
Rate of growth of population r = 10%
Present population = 26620
Let population 3 years ago be x
∴ Applying the formula for population growth which is similar to compound interest,
26620 = `x(1 + "r"/100)^3`
∴ 26620 = `x(1 + 10/100)^3`
= `x(110/100)^3`
∴ x = `26620 xx (100/110)^3`
= ₹ 20,000
The population 3 years ago was ₹ 20,000
APPEARS IN
संबंधित प्रश्न
The interest on a sum of Rs 2000 is being compounded annually at the rate of 4% per annum. Find the period for which the compound interest is Rs 163.20.
At what rate percent per annum will a sum of Rs 4000 yield compound interest of Rs 410 in 2 years?
The present population of a town is 28000. If it increases at the rate of 5% per annum, what will be its population after 2 years?
A certain sum amounts to Rs. 5,292 in two years and Rs. 5,556.60 in three years, interest being compounded annually. Find: the original sum.
Mohit invests Rs. 8,000 for 3 years at a certain rate of interest, compounded annually. At the end of one year it amounts to Rs. 9,440. Calculate:
- the rate of interest per annum.
- the amount at the end of the second year.
- the interest accrued in the third year.
Calculate the amount and the compound interest on Rs. 12,000 in 2 years and at 10% per year.
Rohit borrowed ₹ 40,000 for 2 years at 10% per annum C.I. and Manish borrowed the same sum for the same time at 10.5% per annum simple interest. Which of these two gets less interest and by how much?
The number of conversion periods in a year, if the interest on a principal is compounded every two months is ___________
The cost of a machine is ₹ 18000 and it depreciates at `16 2/3 %` annually. Its value after 2 years will be ___________
A sum is taken for two years at 16% p.a. If interest is compounded after every three months, the number of times for which interest is charged in 2 years is ______.
