Profit = S.P - C.P
1) C.P. = 100 , S.P. =300
∴ Profit = 300-100 = 200
2) C.P. = 100 , S.P. = 150
∴ Profit = 150 - 100 = 50
3) C.P. = 75 , S.P. = 100
∴ Profit = 100 - 75 = 25
4) C.P. = 110 , S.P. = 180
∴ Profit = 180 - 110 = 70
So, from the least profitable to the most profitable sale, the order will be
25 < 50 < 70 < 200