GMAT Percentages, Profit + Loss

A man spends 70% of his salary on food expenses, 40% of the rest on traveling expenses, 90% of the rest on house rent and was finally left with $3600. How much did he spend on traveling expenses?

A certain amount of solution contains 18% alcohol. 8 litres of the solution is taken out and replaced with water. The resultant solution contains 15% alcohol. Find the volume(in litres) of the solution

Mr. X sold an article at 10% loss. Had he bought it for 20% less and sold it for $77 more he would have gained 30%. Find its Cost Price?

What profit percentage is obtained by selling an article at certain price if by selling at 2/3 of that price there is a loss of 16%?

Mr. Peter purchases an article at a discount of 20%, sells it at $60 more than its marked priced and thus gained 50%. Find the Marked Price of the article.

Mr.John used to purchase certain number of mangoes for $360. Since the price of mangoes is reduced by 10% he got 12 more mangoes today. Find the original price of 120 mangoes.

A shopkeeper increases the price of an article by X% and then decreases it by X%. As a result the price of the article is reduced by $180. After one more such change the price is further reduced by $153 Find the original price of the article.

A man sold 20 articles for $60 and gained 20%. How many articles should he sell for $90 to incur a loss 20%?

A man purchases every 11 articles for $10 and sells every 10 articles for $11. How many articles should he sell to gain $63?

A man sold two books at the same price. On the first book he gained 20% and on the second he gained 30%. By what percent is the cost price of first book more than that of the cost price of the second book?

A dealer decides to sell his goods at Cost Price but still gains 25%. How many grams does he give instead of a kg?

A milk vendor sells milk at Cost Price but still gains 20%. Find the ratio of milk and water in every gallon that he sells.

A single discount % equal to three successive discounts of 30%, 20% and 10%.

Cost Price of an article is $380. It is sold at a loss of 3%. Had it been sold for another $19 more what would have been the gain/loss % ?

A man sold two books at $1820 each. On the first book he gained 30% and on the other he lost 30%. Find the combined cost price of both the books.