A man sells an article at a profit of 40%. If he had bought it at 40% less and sold for Rs. 100 less, he would have gained 50%. Find the cost price of the article?

50 60 70 80

50

Suppose CP = 100 than case1 → sp= 40% profit = 140 case 2 → Now CP = 40% less = 60 than SP= 150% of 60= 90 difference of SP= 140–90= 50 when difference rs 50 than CP= 100 so rs 25 difference than CP= 100×25/50= 50