Aptitude - Compound Interest - Discussion

Discussion Forum : Compound Interest - General Questions (Q.No. 1)
1.
A bank offers 5% compound interest calculated on half-yearly basis. A customer deposits Rs. 1600 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is:
Rs. 120
Rs. 121
Rs. 122
Rs. 123
Answer: Option
Explanation:
Amount
= Rs. 1600 x 1 + 5 2 + 1600 x 1 + 5
2 x 100 2 x 100
= Rs. 1600 x 41 x 41 + 1600 x 41
40 40 40
= Rs. 1600 x 41 41 + 1
40 40
= Rs. 1600 x 41 x 81
40 x 40
= Rs. 3321.

C.I. = Rs. (3321 - 3200) = Rs. 121

Discussion:
220 comments Page 17 of 22.

Anu said:   1 decade ago
Hi jyoti that was really good and simple explanation.

Shekhar said:   1 decade ago
Why did subtract one in most of cases? please reply.

Sagar said:   8 years ago
If haf yearly then n=2n and if for 2years then n=2n.

Vikram said:   1 decade ago
Give the mathemetical formula for compund interest.

Ravi said:   1 decade ago
Hey guys what formula use for this? please help me.

Deepa said:   10 years ago
Thank you all those helped me to clear the problem.

Venkat said:   1 decade ago
venkst:simple customer deposited twice
1600*2=3200

Suresh said:   1 decade ago
Well. Is there any shortcuts to solve the problem?

Chiranjit said:   1 decade ago
I can't understand (1+5/2*10). Please explain it.

Vishal said:   1 decade ago
Best way was shows by Jyoti.... Kudos Jyoti... :)


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