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For 1st year, c.i= 20000×1×10/100=2000

for 2nd year, c.i=22000×1×10/100=2200

for 3rd year, c.i= 24200×1×12/100=2904
total c.i=2000+2200+2904=7104
a=20000+7104 =27104
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