Apples cost $5$ paise each. They are sold at $20\%$ profit. Find out the selling price of one dozen apples.

If I buy a radio for $300$ And sell it for $330,$ my gain percentage is:

An umbrella marked at $80$ is sold for $68.$ What is the rate of discount?

A man buys a bicycle for $\mathrm{Rs}.330$ after receiving a $12\%$ discount. What is the marked price?

By selling an electric pump at a cost for $4800,$ a farmer loses one-quarter of what it cost him. What was the cost price?

The loss incurred in selling an article for $\mathrm{Rs}.19$ is as much as the profit made when it is sold at $5\%$ profit. To get $5\%$ profit, what should be its selling price?

Mohandas mixes $10 \mathrm{kg}$ of oil purchased at $\mathrm{Rs}.15$ per $\mathrm{kg}$ with $5 \mathrm{kg}$ of oil purchased at $\mathrm{Rs}.10$ per $\mathrm{kg}.$ If he sells the mixture and gets $12.5\%$ Profit, what is the selling price of the oil per $\mathrm{kg}?$