Question

please solve question no 9th plz brorhers and sisters

Answer 1

$<b>Heya mate. (^_-). Solution below.$
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♦ Given rate of interest (R) = 7 whole ½% p.a. = 15/2% p.a.

♦ Given time (n) = 3 years.

♦ Let the sum (P) be 'x'.


♦ Then, amount (A),

= P (1 + R/100)^n

= x (1 + 15/2/100)^3

= x (1 + 15/200)^3

= x (200 + 15/200)^3

= x (215/200)^3

= x × (43/40)^3

= x × 79507/64000

= 79507x/64000



♦ Then, Compound interest (C.I),

= A - P

= 79507x/64000 - x

= (79507x - 64000x)/64000

= 15507x/64000




♦ But, C.I (given) = 3101.40


→→→ 15507x/64000 = 3101.40

=> x = 3101.40 × 64000/15507

=> x = 198489600/15507

=> x = 12800


•°• The sum is 12800 Rs.
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Thank you..