1.

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»

<P>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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