Question

9. Some principal amount is doubled in 20 years at simple interest. What is the rate of interest per annum? (A) 5% (B) 8% (C) 10% (D) 12% (A (C​

Answer 1

Answer:

10 percent

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Answer 2

Step-by-step explanation:

A=P+SI

⇒2P=P+SI so SI=P

SI=

100

PRT

⇒P=

100

P×R×20

⇒R=

20

100

=5%