We know that
C.P. = S.P. – Gain
Substituting the values
=340–20
=₹320
Find the cost price, if: (i) S.P = Rs.21 and gain =5%
Find the cost price, if : (i) S.P. =Rs. 1,680 and profit = 12% (ii) S.P. = Rs. 1,128 and loss = 6%