4r = 100
⇒ r = 25%
Rate of interest r = 25%
Advertisements
Advertisements
Question
If a principal is getting doubled after 4 years, then calculate the rate of interest. (Hint: Let P = ₹ 100)
Sum
Advertisements
Solution
Let the principal P = ₹ 100
Given it is doubled after 4 years
i.e. Time n = 4 years
After 4 years A = ₹ 200
∴ A = P + I
A – P = I
200 – 100 = I
After 4 years interest I = 100
I = `"Pnr"/100`
⇒ 100 = `(100 xx 4 xx "r")/100`
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
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?
At a rate of 10 p.c.p.a., what would be the interest for one year on rupees 6000?
Aravind borrowed a sum of ₹ 8,000 from Akash at 7% per annum. Find the interest and amount to be paid at the end of two years
In what time will ₹ 17800 amount to ₹ 19936 at 6% per annum?
A sum of ₹ 48,000 was lent out at simple interest and at the end of 2 years and 3 months the total amount was ₹ 55,560. Find the rate of interest per year
A principal becomes ₹ 17,000 at the rate of 12% in 3 years. Find the principal.
Given the principal = Rs 40,000, rate of interest = 8% p.a. compounded annually. Find principal for 2nd year.
Rajni and Mohini deposited ₹ 3000 and ₹ 4000 in a company at the rate of 10% per annum for 3 years and `2 1/2` years respectively. The difference of the amounts received by them will be ______.
₹ 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.
Divide ₹ 10000 in two parts so that the simple interest on the first part for 4 years at 12 per cent per annum may be equal to the simple interest on the second part for 4.5 years at 16 per cent per annum.
