allerySchool RD: ₹1,000 monthly at 6% yearly. Extending 12 months to 13 adds how much interest?
A₹5
B₹65
C₹60
D₹130
Answer & Solution
Correct answer: B. ₹65
The additional interest is 1000×6×(13×14−12×13)/2400, or ₹65.
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