Question

The simple interest on a certain sum for 5 years at 11% per annum is ₹ 640 less than the simple interest on the same sum for 7 years at 9% per annum. Find the sum.
₹

Answer 1

Answer:

Let Rs. P be the sum

At 12% per annum the interest for 8 years

=

100

P×12×8

=

25

24P

qat 14% per annum the interest for 5 years

=

100

P×14×5

=

10

7P

ACQ,

⇒

25

24P

=3120+

10

7P

⇒(

25

24

−

10

7

)P=3120

⇒(

100

96−70

)P=3120

⇒(

100

26

)P=3120

⇒P=

26

3120×100

⇒P=12000

Answer 2

Answer:

8000

Step-by-step explanation:

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