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I am posting some problems.Some of these I cant solve, some I take too long to solve and some I find really interesting. If you can solve them it would be great.

Post your results here and kindly explain the solution and tell the fastest procedure (shortcuts or anything) to solve them to me via pm so that there arent any spoilers for others.

Other people can also post their questions if they want. Here are few simple ones to start.

(1). A dishonest shopkeeper deceives by 15% at the time of purchase of the articles and also 15% at the time of the sale.Find out the percentage of profit.

(2). A tank is filled 10% in one hour and 8% of the water is emptied in the next hour. If it is repeated again,find the percentage of tank filled with water.

(3). A contactor took a contract for building 12 kilometre road in 15 days and employed 100 labours on the work.After 9 days he found that only 5 kilometre road had been constructed.How many more labours should be employed to ensure that the work may be completed within the given time?