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1. A dealer had 24 mobile phones. He sold some of them at a profit of Tk.950 each and he sold the rest at a loss of Tk.500 each. If his total profit was Tk.9750, how many phones did he sell at a loss?
- A. 6
- B. 6
- C. 6
- D. 6
Answer: Option D
Explanation:
Let the number of phones he sold at a loss be X.
Then. (24 - X)×950 - 500X = 9750
or, 24×950 - 950X - 500X = 9750
or, 950X + 500X = 24×950 - 9750 = 22800 - 9750 = 13050
or, 1450X = 13050
or, X = 13050 / 1450 = 9
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