A shopkeeper cheats to the extent of 8gm while buying and selling fruits, by using tampered weights. Calculate his total gain percentage.

To solve this problem, we need to make a few assumptions since the question doesn't provide all the necessary details. Let's assume that the shopkeeper is supposed to buy and sell 1kg (or 1000gm) of fruits.

Step 1: When buying, the shopkeeper gets 1008gm of fruits but pays only for 1000gm.

Step 2: When selling, the shopkeeper sells only 992gm of fruits but receives payment for 1000gm.

Step 3: So, for every 1000gm of fruits, the shopkeeper effectively gains 16gm (8gm while buying and 8gm while selling).

Step 4: To calculate the gain percentage, we use the formula:

Gain% = (Gain / Cost Price) * 100

Here, the gain is 16gm and the cost price is 1000gm.

Step 5: Substituting the values in the formula, we get:

Gain% = (16 / 1000) * 100 = 1.6%

So, the shopkeeper's total gain percentage is 1.6%.