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School RD: deposits ₹9,600, interest ₹400. Same term, monthly sum doubles and rate halves. New maturity?

A₹19,200
B₹10,000
C₹19,600
D₹20,000
Answer & Solution
Correct answer: C. ₹19,600
Interest stays ₹400 while deposited principal doubles to ₹19,200, giving maturity ₹19,600.
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