Question

$\huge\bf\red{Questions:}$
11. A certain sum of money doubles itself in 8 years. In how much time will it become 4 times of itself at
the same rate of interest?
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12. The difference between simple interest on a sum of money for 5 years and for 3 years at 5% per annum
2600. Find the sum.
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13. If a certain principal amounts to $55,000 at 15% per annum over 4 years, how much will it amount to in 6 years?
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14. Divide 317,100 into two parts such that the simple interest on the first part for 3 years at 7% per annum is equal to the simple interest on the second part for 4 year at 9% per annum.
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$don't\:be\:greedy\:for\:points$ ​

Answer 1

Answer:

According to the question data --

to find :

T = ?

given data :

P = p

A = 4 x p

A = 4p

R = 12.5%

=> SI = A - P

=> SI = 4p = p

=> SI= 3p

=> T = ( SI x 100 ) / (P x R)

=> T = (3p x 100 ) 100 / p x 12.5

=> T = 3 x 200 /25

=> T = 24years <= answer