y=441.5 110x+115y=44,150 ......(ii) Equating equation (i) and multiplying with 110 and subtracting from (ii); we get: y = 250 CP of wall clock y = 250 CP of watch = 390 - 250 = 140 Difference between the original prices of wall clock and watch is equal to = 250 - 140 = Rs 110.