AMU MCA Profit And Loss Previous Year Questions (PYQs)
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At simple interest, a sum doubles after 20 years. The rate of interest per annum is:
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Solution
For doubling in simple interest: $R = \frac{100}{T}$
$R = \frac{100}{20} = 5%$
Oranges are bought at the rate of 10 for Rs. 25 and sold at the rate of 9 for Rs. 25. The profit is:
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Solution
Cost price per orange $= \frac{25}{10} = 2.5$
Selling price per orange $= \frac{25}{9}$
Profit per orange
$= \frac{25}{9} - 2.5 = \frac{25 - 22.5}{9} = \frac{2.5}{9}$
Profit %
$= \frac{\frac{2.5}{9}}{2.5} \times 100 = \frac{100}{9} = 11\ \frac{1}{9}%$
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
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Solution
Difference (2 years) $= P\left(\frac{R}{100}\right)^2$
$1 = P\left(\frac{4}{100}\right)^2$
$1 = P \times \frac{16}{10000}$
$P = \frac{10000}{16} = 625$
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