Question

कितने प्रतिशत दर पर एक राशि 8 वर्ष में दोगुनी हो जाएगी ??

Answer 1

मान लिया की मूलधन = X

मिश्रधन= 2X

ब्याज = मिश्रधन - मूलधन = X

दर =( ब्याज ×100)/ (मूलधन ×समय)

दर = (X ×100)×( X ×8)

===12.5 %

Answer 2

The rate of interest is 12.5%

Step-by-step explanation:

Let the principal be x

We are supped to find the rate of interest at which the the sum becomes double in 8 years

Amount = 2x

Interest = amount - Principal

Interest = 2x-x = x

Time = 8 years

$SI= \frac{P \times r \times t}{100}\\x=\frac{x \times r \times 8}{100}\\\frac{100}{8}=r\\12.5\%=r$

Hence the rate of interest is 12.5%

#learn more:

At what rate of simple interest if the sum double in 2years​

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