When Vijay sells 12 pens, he gains the selling price of pens. Calculate his % profit?

17 articles were bought for ₹3910 and sold for ₹4590. How much was the approximate profit percentage per article?

The cost price of an article is 480. If it is to be sold at a profit of 6.25 %, how much would be its selling price? 

Oranges are bought at 7 for Rs. 3. At what rate per hundred must they be sold to gain 33 % ? 

By a selling basket for Rs. 19.50, a shopkeeper gains 30 %. For how much should he sell it to gain 40 %? 

There is 10 % loss if a watch is sold for Rs 1440/-. At What price it is to be sold to get 15 % profit. 

By selling a pen for Rs 105 there is a loss of 30%. At what price (in Rs) the pen must be sold in order to gain 30%?

Sujatha sold 75% of her goods at a profit of 24% and the remaining at a loss of 40%. What is her gain/loss percentage on the whole transaction?