Aptitude - Compound Interest - Discussion

Discussion Forum : Compound Interest - General Questions (Q.No. 4)
4.
What is the difference between the compound interests on Rs. 5000 for 1 years at 4% per annum compounded yearly and half-yearly?
Rs. 2.04
Rs. 3.06
Rs. 4.80
Rs. 8.30
Answer: Option
Explanation:

C.I. when interest
compounded yearly    
= Rs. 5000 x 1 + 4 x 1 + x 4
100 100
= Rs. 5000 x 26 x 51
25 50
= Rs. 5304.

C.I. when interest is
compounded half-yearly
= Rs. 5000 x 1 + 2 3
100
= Rs. 5000 x 51 x 51 x 51
50 50 50
= Rs. 5306.04

Difference = Rs. (5306.04 - 5304) = Rs. 2.04

Discussion:
85 comments Page 4 of 9.

Kajal said:   1 decade ago
Why are you using the formula of amount instead of C.I that means question is demanding for the difference of C.I rather the difference of amount.

Tarun said:   1 decade ago
When interest is compounded annually,

Amount = p[1+(r/100)]^t.

When interest is compounded half yearly,

Amount = p[1+(r/2x100)]^2t.

Varun said:   9 years ago
Just using a formula of the amount when the interest is compound half yearly, ie time =2n here n = 3/2 then,

2n = 3/2 * 2= 3.

Rajjan khan said:   9 years ago
Best way.

Reffective for yearly = 6.08%,
Reffective for half yearly = 6.1208,
Difference = .0408%,

5000 *.0408/100 = 2.04.

Rajjan khan said:   9 years ago
Best way.

Reffective for yearly = 6.08%,
Reffective for half yearly = 6.1208,
Difference = .0408%,

5000 *.0408/100 = 2.04.

Sangeet said:   1 decade ago
Not understand this question. Why we multiply (1+(((1/2)*4)/100)?

Even I am not able understand the further steps.

Deekshit said:   1 decade ago
But the given question is difference b/w year and and half-yearly not as one and half-yearly so the answer is 2.04.

Roop said:   1 decade ago
@Akshay and @Arslan.

When time is in fraction that is 3/2 then the formula is:
A = P[(1+R/100)*{1+(R/2)/100).

Dimple said:   2 years ago
Yearly
5000+4%+2% = 5304.
Half-yearly
5000 + 2% + 2% + 2% = 5306.04.

Therefore, the difference is 2.04.
(40)

Sowmya` said:   1 decade ago
When time is in fraction formula changes as:

For ex time is: 1 1/2 years.

= p(1+r/100)^1*(1+(r/2)/100).


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