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A man sold a horse at 10% profit. Had he bought it at 20% less and sold for Tk. 10 more, he would have made a profit of 40%. What is the cost price of the horse?

A. Tk. 400
B. Tk 500
C. Tk. 600
D. Tk. 100
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সঠিক উত্তরঃ B. Tk 500
Explanation: