A shopkeeper sold a watch for ₹280 and gained profit of ₹12. The cost price of the watch is

The cost price of article A is ₹ 500 more than the cost price of article B. Article A is sold at a loss of 10% and B is sold at a profit of 20%. If there is a profit of ₹200 in the entire transaction, then the cost price of article A is :

Vinay bought 100 pens (all at same cost price). He sold 40 pens at a profit of 20 percent, 20 pens at a profit of 40 percent and the remaining at the cost price. If he had sold all at a profit of 20 percent, then he would have got Rs. 160 more. What is the cost price of each pen?

A ration shop dealer sells his sugar using weights has 10% less than the true weight and makes a profit of 15%. Find his total gain percentage.