Total S.P= Rs 24 Pipe(Loss):
\r\nS.P = 80% of C.P 12
\r\n= (80/100)*C.P C.P
\r\n= 1200/80 C.P
\r\n= Rs 15 Pipe(Profit) S.P
\r\n= 120% of C.P 12
\r\n= (120/100)*C.P C.P
\r\n= 1200/120 C.P
\r\n= Rs. 10
\r\nHence, Total C.P = Rs. 25 As C.P>S.P(Loss)
\r\nLoss= C.P- S.P= 25-24= Rs 1
\r\nHence Ans(3) option