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Question
A student buys a pen for Rs 90 and sells it for Rs 100. Find his gain and gain percent.
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Solution
\[\text { C . P of pen = Rs } . 90\]
\[\text { S . P of pen = Rs . }100\]
Gain = SP - CP
Gain = 100 - 90
= Rs . 10
\[\text { Gain %} = \left( \frac{\text { gain } \times 100}{C . P .} \right)\]
\[ = \left( \frac{10 \times 100}{90} \right)\]
\[ = 11\frac{1}{9}\]%
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| Book | ₹ 225 | x | 8% |
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Match the entries in Column I with the appropriate entries in Column II:
| Column I | Column II |
| (i) 3:5 | (A) ₹ 54 |
| (ii) 2.5 | (B) ₹ 47 |
| (iii) 100% | (C) ₹ 53 |
| (iv) `2/3` | (D) ₹ 160 |
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(L) 0.125 |
| (M) 3 : 2 | |
| (N) ₹ 164 | |
| (O) 3 : 3 |
