Question

What will be the rate of interest if a certain amount of money is doubled in 20 years​

Answer 1

Answer:

A=P+SI

⇒2P=P+SI so SI=P

SI=

100

PRT

⇒P=

100

P×R×20

⇒R=

20

100

=5%

solution

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Answer 2

Answer: At 5% simple interest, a sum of money doubles itself in 20 years.