Profit and Loss...

A man sold an article for $75 and lost something. Had he sold it for $96, his gain would have been double the former loss. The cost price of the article is

Successive discounts of 10% and 20% are equivalent to a single discount of

If a merchant estimates his profits as 20% of the selling price, what is his real profit percent?

Gangaram buys 7000 bananas at Rs. 2 each and agrees to pay an additional sum of Rs. 300 for their delivery. He estimated that 10% of the bananas will be spoiled, so he decides a selling price of Rs. 3 each for the remaining. However, during delivery, 20% of the bananas are spoiled. What should be the percent increase in the selling price in order to obtain the same total profit?