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A dealer of scientific instruments allows 20% discount on the marked price of the instruments and still makes a profit of 25%. If his gain over the sale of an instrument is ₹ 150, find the marked price of the instrument.
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- ₹ 938.50
- ₹ 940
- ₹ 938
- ₹ 937.50
Correct Option: D
Let Marked price of instrument = Rs. p
| ∴ Its S.P. = Rs. | |
| 100 |
| S.P. = Rs. | |
| 5 |
| ∴ C.P.= Rs. |  | − 150 |  | |
| 5 |
| ∴ | = | | − 150 | | × | |||
| 5 | 5 | 100 |
| ⇒ | = | | − 150 | | × | |||
| 5 | 5 | 4 |
| ⇒ | × | = | − 150 | |||
| 5 | 5 | 5 |
| ⇒ | − | = 150 | ||
| 5 | 25 |
| ⇒ | = 150 | |
| 25 |
| ⇒ | = 150 ⇒ 4p = 150 × 25 | |
| 25 |
| ⇒ p = | = Rs. 937.5 | |
| 4 |
