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The first law of thermodynamics is based on the law of conservation of energy, which states that energy cannot be created or destroyed, but can be transferred from one form to another.
An item is marked at (Y + 10)% above its cost price and after allowing a discount of 40%, it is sold at 1% loss. What is the value of Y?
A seller purchases pears for Rs. 192 per dozen and sells each for Rs. 20. If he sells 5 dozen pears, how much profit does he earn in total?
A shopkeeper sells an article at profit of 20% and uses a weight of 25% less instead of 1 kg. Find his actual profit?