Aptitude - Compound Interest - Discussion

Discussion Forum : Compound Interest - General Questions (Q.No. 3)
3.
There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12,000 after 3 years at the same rate?
Rs. 2160
Rs. 3120
Rs. 3972
Rs. 6240
None of these
Answer: Option
Explanation:

Let P = Rs. 100. Then, S.I. Rs. 60 and T = 6 years.

R = 100 x 60 = 10% p.a.
100 x 6

Now, P = Rs. 12000. T = 3 years and R = 10% p.a.

C.I.
= Rs. 12000 x 1 + 10 3 - 1
100
= Rs. 12000 x 331
1000
= 3972.

Discussion:
94 comments Page 10 of 10.

Satya said:   1 decade ago
@Nivedita.

Don't bother about 'P'. Think logically about r% using given data.

Arvindsamy said:   9 years ago
Guys your discussions and solutions are very useful. Thank you all guys.

Malleswar said:   9 years ago
Beautifully explained. Thanks to all.

Prabhakaran said:   9 years ago
Hi, can anyone explain to me why CI = Amount - P if its P we can substitute the actual principal.


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