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 6 of 10.

Pavan said:   10 years ago
I am getting confusion on this problem can anyone tell me in easy way.

Rohani said:   1 decade ago
Why we take S.I as 60 and what is the difference between S.I and C.I?

Katherin said:   5 years ago
I'm confused on using -1. Why it is used?

Please anyone explain.
(16)

Durga said:   9 years ago
@ All, Guys your discussions are very useful. Thank you all.

Renu said:   9 years ago
10% successive of 3 years is 33.1%

33.1% of 12000.
= 3972.

Aditya said:   10 years ago
S.I is interest on Principle.

C.I is interest of interest.

Aparna said:   1 decade ago
How could it come 331/1000? Shall anyone explain me please?

Ramya c said:   5 years ago
Anyone can explain me, why we are calculating for 3 years?

Rajdeep saha said:   2 years ago
C.I = {12,000(1+10/100)^3} - 12000.
=3,972 => (answer).
(19)

Sangavi said:   7 years ago
When will we use -P in the compound interest formula?


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