The marked price of an article is 40% above its cost price. If its selling price is $73{1 \over 2}$% of the marked price, then the percentage profit is:

Sita sold a whiteboard marker set at 10% profit. On selling it for Rs. 20 more, she would have earned a profit of 15%. What is the cost price of the whiteboard marker set?

A shopkeeper sells his goods by allowing 18% discount and still earns 30% profit. If he sells his goods by allowing 12% discount on the marked price, then what will be his profit percentage (correct to 2 decimal places)?

R’s weighing machine shows 400 gm when the actual weight is 350 gm. The cost price of almonds is ₹880 per kg and packets of 200 gm are made using the faulty machine. What should be the selling price (in ₹) of each packet to get a profit of 25%?