The price of wheat in the year 2010 has increased by 10% from that of the previous year. In 2011, the price has decreased by 5%, what was the increase in price in 2011 with respect to that of 2009

If the cost price of 20 articles is equal to the selling price of 25 articles, what is the % profit or loss made by the merchant?

By selling an article at 80% of its market price, a merchant makes a loss of 12%, What will be the percentage of profit made by the merchant if he sells the article at 95% of its market price?

What is the maximum percentage discount that a merchant can offer on her Market Price so that she ends up selling at no profit or loss, if she had initially marked her goods up by 50%?