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?
What is the value of $$4(12 - 10 + 42 - 17) \div 3 + 4$$?
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?
What is the value of $$[81 of (44 - 11 + 2) \div (44 \div 22 + 5)]$$?
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?
Evaluate: $$[(36 - 12) \div 6] + [98 - 21 \div 3 \times 2]$$
If total surface area of a cube is 600 cm$$^2$$, then what is the volume of cube?