Question

at what rate percent compound interest per annum will rs 640 amount to rs774.40 in 2 years

Answer 1

$\huge \mathfrak{holla \: sis}$

here is ur answer ➖➖➖➖➖➖➖➖➖➖➖➖➖⬇

Given Principle(P) = Rs 640
       
   Amount (A)= Rs 774.40
         
 time (n) = 2 years

A = P(1+r/100)^n

⇒ 774.40 = 640(1+r/100)²

⇒ 774.40/600 = ([100+r]/100)²

⇒ 1.21 = ([100+r]/100)²

⇒ √1.21 = (100+r)/100

⇒ 1.1 = (100+r)/100

⇒ 1.1*100 = 100+r

⇒ r = 110 - 100 = 10%

  Rate of interest = 10%

hope it helps you...

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