Aptitude - Simple Interest - Discussion
Discussion Forum : Simple Interest - General Questions (Q.No. 1)
1.
A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:
Answer: Option
Explanation:
S.I. for 1 year = Rs. (854 - 815) = Rs. 39.
S.I. for 3 years = Rs.(39 x 3) = Rs. 117.
Principal = Rs. (815 - 117) = Rs. 698.
Discussion:
174 comments Page 10 of 18.
Md sahil said:
1 decade ago
Sum amounts to 815 in 3 years.
Sum amounts to 854 in 4 years.
Find sum?
Let the sum be Rs. x.
x = principal amounts in 3 years = Rs. 815.
x = principal amounts in 4 years = Rs. 854.
Principal amount in 1 year = 39 I.
Interest of 1 year = Rs. 39.
Interest of 3 year = 3x39= Rs. 117.
Principal = x.
Rate = ?
Time = 3 years.
For 3 years.
Interest = Rs. 117.
Amount = Rs. 815.
Time = 3 years.
Let rate = R%.
A = p+I.
P = A-I.
= R(815-117).
Rate 698 answer.
Sum amounts to 854 in 4 years.
Find sum?
Let the sum be Rs. x.
x = principal amounts in 3 years = Rs. 815.
x = principal amounts in 4 years = Rs. 854.
Principal amount in 1 year = 39 I.
Interest of 1 year = Rs. 39.
Interest of 3 year = 3x39= Rs. 117.
Principal = x.
Rate = ?
Time = 3 years.
For 3 years.
Interest = Rs. 117.
Amount = Rs. 815.
Time = 3 years.
Let rate = R%.
A = p+I.
P = A-I.
= R(815-117).
Rate 698 answer.
Naren said:
10 years ago
815-p = 3*x.1 -----> equation 1.
854-p = 4*x.2 -----> equation 2.
Divide equation 1 with equation 2.
854-p = 4*x.2 -----> equation 2.
Divide equation 1 with equation 2.
Sumair mudliar said:
10 years ago
@Md Sahil.
Thank you for explaining the solution.
Thank you for explaining the solution.
Imran syed said:
10 years ago
For simple interest, this formula is very helpful.
That is I = Prt.
That is I = Prt.
Salomi said:
10 years ago
@Gayathri.
Thank you for explaining the solution clearly.
Thank you for explaining the solution clearly.
Kabali said:
10 years ago
@Gayathri nice explanation.
Mick sudama said:
10 years ago
Here you can do it by another S. I 1 yr = 39, in 4 years =156, & principle=854 - 156 = 698.
Aparna said:
9 years ago
Crystal clear explanation, Thanks @Gayathri.
Kitty said:
9 years ago
@Appu.
Your explanation is good, Thank you.
Your explanation is good, Thank you.
Sachin said:
9 years ago
Thanks @Vikram and @Gayatri.
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