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Explanation:
Principal = Rs.400, Amount = Rs.480
Simple Interest = Rs.(480−400)
=Rs.80
Time = 4 years
Rate in percentage =SI×100\P×T
Rate in percentage =80×100\400×4=8000\1600=5%
New rate of interest
=(5+2)=7%
Interest=400×7×4\100=112
Hence amount=Rs.(400+112)
=Rs.512