Final answer:
To calculate the profit percentage when the exchange rate of the pound changes, we need to first calculate the buying and selling rates after the devaluation. Then, we can calculate the profit and the profit percentage.
Step-by-step explanation:
To calculate the profit percentage when the exchange rate of the pound changes, we need to first calculate the buying and selling rates after the devaluation. Since the buying rate is Rs 148 and the pound is devaluated by 10%, the new buying rate will be 148 * (1 - 0.10) = Rs 133.2. Similarly, the new selling rate will be 150 * (1 - 0.10) = Rs 135. Now, let's calculate the profit:
Cost price (CP) = Rs 26000
Selling price (SP) = No. of pounds bought * selling rate = Rs 26000 / 150 * 135 = Rs 29400
Profit = SP - CP = Rs 29400 - Rs 26000 = Rs 3400
Profit percentage = (Profit / CP) * 100 = (3400 / 26000) * 100 = 13.08%