Can a price of an item go up by 100%?

Can a price of an item go up by 150%?

Can a price of an item go up by 50%?

Under what conditions can the efficiency of a Carnot engine be 100%?

Price of petrol increased by 10% last year. Now the prices are reduced by 10% Find the net increase or decrease in the price of petrol.

A TV was bought at a price of Rs 21,000. After one year the value of the TV was depreciated by 5% (Depreciation means reduction of value due to use and age of the item). Find the value of the TV after one year.

A factory has two machines A and B. Past record shows that machine A produced 60% of the items of output and machine B produced 40% of the items. Further, 2% of the items produced by machine A and 1% produced by machine B were defective. All the items are put into one stockpile and then one item is chosen at random from this and is found to be defective. What is the probability that it was produced by machine B?