Question

Shruti invested some money at 20% per annum for 3 years (compounded annually). Rashmi invested 3/5
times more money than Shruti for 3 years on simple interest. If they both receive the same amount after 3
years from their respective investments, the rate per annum at which Rashmi has invested her money is:
13%
23%
WIN WIN​

Answer 1

Answer:

1 2/3 %

Step-by-step explanation:

i think this is right answer

Answer 2

Answer:

The rate per annum at which Rashmi has invested her money is: 2.6666666667

Given:

Shruti-

amount invested= x

rate= 20%

time= 3 years

Rashmi-

amount invested= x + (x*3/5)

rate= ?

time= 3 years

To find:

Rate of interest at which Rashmi has invested her money.

Solution:

let the amount invested bu Shruti be 100

Compund interest= amount invested * rate/100^time

= 100 * (20/100)³ = 172.8

then amount invested by Rashmi will be 100 + (100* ⅗)= 160

simple interest= amount invested * time * rate

100

= 160 * 3 * ? / 100 = 12.8(172.8 - 160)

= 160 * 3 * ? = 12.8 * 100

= 480 * ? = 1280

= ? = 1280/480

= 2.666666666.7

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