Question

if a principal is doubled in 10 years then the rate of interest is ?​

Answer 1

Let the principal be x

Time = 10 years

Amount after 10 years gets doubled

So amount = 2x

simple interest = amount - principal

simple interest = 2x - x = x

Rate per annum = SI × 100 / P × T

= x × 100 / x × 10

100x/ 10x = 10

So rate per annum = 10%.

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Answer 2

FUTURE AMOUNT - 20000

PRINCIPAL AMOUNT - 10000

TIME ( IN MONTHS ) - 120

RESULTS -

RATE % ( ANNUALLY ) - 10. 00

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