Which one of the following is correct?

A person buys an article for Rs 120 and sells it for Rs 150 find the profit %?

What is the LCM of 18, 24, and 36?

If the average of P and 4P is 10, then P=?

If 3A=4B=7C, Find A:B:C

The interest on sum of money at the end of 6 years is 3/8 of the sum itself. The rate of interest is….?

सदर मुलुकी खानाबाट रु १ को नोट कहिले निस्किएको थियो ?

An article costing Rs 20 is sold at a profit of Rs 5. What is the profit percent?