Question

Q1.Find the rate of interest for a sum that becomes 2 Times of itself in 2 years, when compounded annually.
Q2. The simple interest on certain sum of money for 3 years at 8% per annum is half of the compound intrest on 4000 for 2 years at 10% per annum.What sum is placed on simple intrest?
Q3. Suzy borrowed from Gurkeet certain sum for 2yrs at simple intrest. Suzy lent this sum to hamida at same rate for 2yrs compound interest. at the end, she recieved 110 as compound interest but paid 100 as simple interest. Find the sum and the rate of interest.

Answer 1

Q.1 ANSWER=

amount (A)= 2x

principle (P) = x

time (T)= 2

Rate of interest (R)= ?

s.i (Simple interest)= A - P

s.i= 2x - x

s.i = x

as, we have to find rate of interest, so the formula used here will be......

$r \: = \binom{s.i \times 100}{p \times t}$

$r \: = \binom{x \times 100}{x \times 2}$

the next step is in the drawing...... ☝️

rate = 50%

Answer 2

Answer:

Step-by-step explanation:

1) let the principal be=P

given time =2 years,and rate of interest be=?

then amount =729/625p

the rate of interest =8% per annum