Question

at what rate percentage p. a will a sum of Rs 6400 amount to Rs 74088 per 3 year of compound interest​

Answer 1

Answer:

5 %

i think there is a problem in this question if there will be a zero in 6400 this question will be perfect i am giving answer for this question with 64000 in place of 6400 is it be ok , so please mark me as brainlist as i have done this question 2 times

explanation:

a = p ( 1 + r / 100 ) ^n

74088 = 64000 ( 1 + r /100 ) ^3

74088/64000= ( 1 + r /100 ) ^ 3

9261 /8000 = ( 1 + r /100 ) ^ 3

21 / 20^3 = 1 + r / 100 ^ 3

both the powers are same so they will cut

21 / 20 - 1 = r / 100

1 / 20 = r / 100

100/ 20 = r

5 = r

rate of intrest is 5%