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Gain means interest i.e S.I
time (t)= 2 years
rate of interest (r%) = 10% p.a
S.I = Rs. 24
Principal (P) = ?
Amount ( A) = P+S.I
P = (S.I×100)/t×r
⇒ P = 2400/20
P = Rs. 1200                                                            Ans.
Hence, the Principal is Rs.1200 
Amount (A)=  P+S.I
Rs.  1224                                              Ans.
I hope the answer is correct.
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