The cost price of an article is 8550. What should be the selling price of the article so that there is a profit of 9%?

The price of an article is first increased by 25% and later on decreased by 40% due to reduction in sales. Find the net percentage change in final price of the article.

The profit earned by selling an article at 3600 is equal to the loss incurred on selling the same article at 2800. What will be percent profit, if the article is sold at 5000?

X bought an item at 25% discount on its original price. He sold it with 40% increase on the price he bought it. The new sale price is by what percent more than the original price?

If a:b= 4:5, a:c= 1:2 then b:c=?

If x : y = 3 : 1, then x³– y³ : x³ + y³ =?

If A: B: C = 3:4:5 and B= x% of (A+C), then x is equal to?

In a class the number of girls is 20% more than that of the boys. The strength of the class is 66. If 4 more girls are admitted to the class, the ratio of the number of boys to that of the girls is