Profit And Loss Questions

If selling price is doubled, the profit triples. Find the profit percent ?

A milkman purchases the milk at Rs. X per litre and sells it at Rs. 2x per litre still he mixes 2 litres water with every 6 litres of pure milk. What is the profit percentage?

If 24.2 kg of ghee costs Rs. 12525.92, how much would 8.5 kg of the same ghee cost?

A sports accessories shop organises a running event for kids with an entry fee of Rs. 200 to be registered on the spot. 6 They were expecting 300 entries, and on the event's day, only 200 turned up. How much less money did they receive in the entry compared with their initial expectation of 300 entries?

Qamar gained 12.5% on the resale of a used stereo. If he purchased the item for Rs.1680, how much did he sell it for?