Question

4. The SI on the certain sum of money for 2 yr at 8% per annum is 2560. What is the sum? (1) 16000 (3)R 13000 (2)R 15000 (4) None of these​

Answer 1

Answer:

The difference between the simple interset and compound interest on a certain sum of money 'P' for 2 years at r% per annum is given by :

⇒(CI−SI)

2year

=

100

2

Pr

2

Using the above formula for a sum of money 'P' invested for two years at 4% p.a., given that the difference between CI&SI is Rs.20

∴20=

100

2

P(4)

2

⇒20=

100×100

P(4×4)

⇒5×25×100=P

⇒P=Rs.12500

Hence, the answer is Rs.12500.

Answer 2

Answer:

Option (1) 16000 is the correct answer
See explanation below

Step-by-step explanation:
Here P=?, R= 8%, T= 2yrs, & SI = 2560
SI= P*R*T/100
∴ PRT/100 = 2560
∴ P*2*8/100 = 2560
∴ P*16 = 2560*100
∴16P = 256000
∴ P = 256000/16
∴ P = 16000

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