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Interest on Rs 3000 at 10% per annum for a period of 3 years is ________.

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Narain bought 120 oranges at Rs 4 each. He sold 60 % of the oranges at Rs 5 each and the remaining at Rs 3.50 each. His _______ is ________%.

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A fruit seller purchased 20 kg of apples at Rs 50 per kg. Out of these, 5% of the apples were found to be rotten. If he sells the remaining apples at Rs 60 per kg, then his _________is _________%.

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Amount obtained by depositing Rs 20,000 at 8 % per annum for six months is ________.

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Interest on Rs 12500 at 18% per annum for a period of 2 years and 4 months is ________.