see the question no 15 and answer
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Simple interest (s.i.) =( p×r×t)/100
Where p = principal
r = rate of interest per annum
t= time in years
In this case,
Amount (A)=3920, r= 7.5% t = 3
Amount (A) = p + s.i.
=> 3920 = p+ prt/100
=> p = 3200
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