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:
172 comments Page 18 of 18.
Raj said:
4 months ago
Nice explanations, thanks all.
(9)
GOPINADH AKULA said:
2 months ago
To find the sum (principal) when simple interest is involved, we can use the given information:
Amount after 3 years = Rs. 815
Amount after 4 years = Rs. 854
Step 1: Calculate the interest for 1 year:
Interest for 1 year = Amount after 4 years - Amount after 3 years.
= Rs. 854 - Rs. 815,
= Rs. 39.
Step 2: Calculate the total interest for 3 years (since after 3 years the amount is Rs. 815):
Interest for 3 years = 3 × Interest for 1 year.
= 3 × Rs. 39,
= Rs. 117.
Step 3: Calculate the principal (sum):
Principal = Amount after 3 years - Interest for 3 years,
= Rs. 815 - Rs. 117,
= Rs. 698.
So, the sum (principal) is Rs. 698.
Amount after 3 years = Rs. 815
Amount after 4 years = Rs. 854
Step 1: Calculate the interest for 1 year:
Interest for 1 year = Amount after 4 years - Amount after 3 years.
= Rs. 854 - Rs. 815,
= Rs. 39.
Step 2: Calculate the total interest for 3 years (since after 3 years the amount is Rs. 815):
Interest for 3 years = 3 × Interest for 1 year.
= 3 × Rs. 39,
= Rs. 117.
Step 3: Calculate the principal (sum):
Principal = Amount after 3 years - Interest for 3 years,
= Rs. 815 - Rs. 117,
= Rs. 698.
So, the sum (principal) is Rs. 698.
(27)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers