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.
Explanation: 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.
