When the per unit production cost of an item is Tk 80 and other costs per unit is Tk 20, the producer makes a profit of 15% on his total cost. If the production cost decreases by 20% and the selling price remains the same, calculate the profit in Tk.

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সঠিক উত্তর: । ব্যাখ্যা: Total cost $= 80+20 = 100$, so, selling price $= 1.15 \times 100 = 115$. New production cost $= 0.8 \times 80 = 64$, so, new total cost $= 64+20 = 84$. New profit $= 115-84 = 31$ Tk.