Question

the interest on a sum of money at 6% per annum for 7 year is equal to the twice interest on another sum of money for 9 years at 5% per annum find the ratio of the two sums​

Answer 1

Answer:

R= 6%

t = 7 years

principal =P

SI = P*R*t/100. eq(1)

again,

R' = 5%

t' = 9 year's

P' = principal

SI' = P'*R'*t'/100. eq(2)

a/q

P*6*7/100=P'*5*9/100

Required ratio P/P' = 18/21

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Step-by-step explanation:

Answer 2

Step-by-step explanation:

interest (I) =P×R×N/100

I. e.( I) =X×6×7/100 (P=X) ...1

(I) =y×5×9/100 (P=y)....,2

from 1 and,2

X×6×7/100=Y×5×9/100

X×42=Y×45

X=Y/45=42

X=Y:15=14