Advertisements
Advertisements
प्रश्न
A sum of money, lent out at simple interest, doubles itself in 8 years. Find :
(i) the rate of interest
(ii) in how many years will the sum become triple (three times) of itself at the same rate percent?
Advertisements
उत्तर
Let P = Rs.100, A = Rs.200
I = Rs.200 − Rs.100 = Rs.100, T = 8 years
R =`(100xx"I")/("P"xx"T")=(100xx100)/(100xx8)`
`=100/8=25/2%`
Now again P = Rs.100
A = Rs.300
I = Rs.300 − Rs.100 = Rs.200
R = `25/2%`
T =`(100xx"I")/("P"xx"R")=(100xx200)/(100xx25/2)=(100xx200xx2)/(100xx25)`
= 16 Years
So the given sum of money will become triple in 16 years.
APPEARS IN
संबंधित प्रश्न
What sum of money borrowed on 24th May will amount to Rs.10210.20 on 17th October of the same year at 5 percent per annum simple interest.
Vinita deposited Rs. 15000 in a bank for one year at an interest rate of 7 p.c. p.a. How much interest will she get at the end of the year?
The value of a machine depreciates at 10% per year. If the present value is ₹ 1,62,000, what is the worth of the machine after two years?
A sum of ₹ 46,900 was lent out at simple interest and at the end of 2 years, the total amount was ₹ 53,466. Find the rate of interest per year
In the first year on an investment of Rs 6,00,000 the loss is 5% and in the second year the gain is 10%, the net result is ______.
Interest on ₹ 3000 at 10% per annum for a period of 3 years is ______.
The interest on ₹ 350 at 5% per annum for 73 days is ₹ 35.
₹ 6400 were lent to Feroz and Rashmi at 15% per annum for `3 1/2` and 5 years respectively. The difference in the interest paid by them is ₹ 150.
Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in `2 1/2` kg of chalk.
₹ 9000 becomes ₹ 18000 at simple interest in 8 years. Find the rate per cent per annum.
