Question
A principal amount is invested at an annual simple
interest rate of R%, growing to Rs. 9,500 over 5 years and Rs. 13,100 over 9 years. Calculate the total interest earned if this principal is invested at an increased rate of (R + 7)% per annum for 2 years.Solution
Simple interest for 4 years = 13100 – 9500 = 3600 Simple interest for 1 year = 3600/4 = Rs. 900 Principal amount = 9500 – 5 × 900 = Rs. 5000 So, R = 900/50000 × 100 = 18% Desired interest = 5000 × 0.25 × 2 = Rs. 2500 Hence, option b.
A and B together can complete a work in 12 days, and B alone can complete it in 20 days. How many days will A take to complete the work alone?
A can complete a piece of work in 10 days. B in 15 days and C in 20 days. A and C worked together for two days and then A was replaced by B. In how many...
Machine X is 100% more efficient than Machine Y, and Machine Y is 75% more efficient than Machine Z. Machines X and Z, working together, can complete a ...
A man takes 200 days to finish a work alone. If he started working alone and joined by one more man having same efficiency as of him every day from 2nd ...
‘X’ and ‘Y’ together can complete a work in 16 days, while ‘Y’ and ‘Z’ together can complete the work in 10 days. If ‘Y’ takes 20 da...
A pipe can fill a tank in 14 hours, and B pipe can drain a tank in 21 hours. If a system of N pipes (fill pipes and drain pipes put together) can...
20 men or 40 women can complete a piece of work in 24 days. A man and a woman together complete the work and receive a total wage of Rs. 12,000. Find th...
Sushil can type 40 lines in 20 minutes but he leaves 8% margin on each line. In how much time he will type 46 pages with 80 lines on each page in which...
A and B are capable of completing a project individually in 40 days and 50 days, respectively. Initially, A and B collaborated on the project, and after...
4 girls can do work in 8 days, 3 boys can do the same work in 9 days, 7 men in 2 days, and 5 women in 4 days. Who is the least efficient?
Relevant for Exams:
