Arun bought 20 oranges at the rate of 6 each. Later he found that 8 oranges are defective. At what rate should he sell each orange so as to make a profit of 10% on the whole transaction?

A man bought a number of oranges at 3 for a rupee and an equal number at 2 for a rupee. At what price per dozen, should he sell them to make a profit of 20% ?

A man bought 500 metres of electronic wire at 50 paise per metre. He sold 50% of it at a profit of 5% . At what percent should he sell the remainder so as to gain 10% on the whole transaction?

By selling oranges at the rate of Rs 6 3/4 — per orange, a man gets Rs 378. How many oranges does he sell?