A man sells 2 commodities for Tk. 4000 each, neither losing nor gaining in the deal. If he sold one commodity at a gain 25% then what is the cost price of another commodity?

A man sells 2 commodities for Tk. 4000 each, neither losing nor gaining in the deal. If he sold one commodity at a gain 25% then what is the cost price of another commodity? Correct Answer Tk.4800

Total S.P. = Tk. 8000 andTotal C.P. = Tk. 8000S.P. of 1st commodity = Tk. 4000Gain on it = 25%∴ C.P. of 1st commodity = Tk. {(100/125)×4000}                                          = Tk. 3200C.P. of 2nd commodity = Tk. (8000−3200) = Tk. 4800 Ans 
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