For the following questions answer them individually
If the cost price of an article is 80 percent of its selling price, then what is the profit percentage?
Price of 1 kg of sugar is increased by 34 percent and die increase is of Rs. 51. What is the new price of the sugar per kg?
A shopkeeper sells his goods at a 12% profit after marking them up by 20%. What is the discount percentage?
Average price of 38 pens is Rs. 25. If 8 new pens are added, then the average price rise by Rs. 4. What is the total price of the 8 new pens?
A person loses 15 percent on selling 50 shoes for Rs. 85. What should be the selling price of 50 shoes to earn a profit of 35 percent?
At what annual rate of interest will a sum of money be thrice in 5 years at simple interest?