Final answer:
To find the percentage gain, calculate the difference between the selling price and the buying price, and express that difference as a percentage of the buying price. In this case, the man's percentage gain is 11.76%.
Step-by-step explanation:
To find the percentage gain, we need to calculate the difference between the selling price and the buying price, and then express that difference as a percentage of the buying price.
Step 1: Calculate the difference between the selling price and the buying price: 9500 - 8500 = 1000 GH cedis.
Step 2: Calculate the percentage gain: (1000 / 8500) * 100 = 11.76%.
Therefore, the man's percentage gain is 11.76%.