Selling price of the TV = 8000 + 8/100 × 8000 = Rs 8640
Selling price of the VCR = 8000 - 4/100 × 8000 = Rs 7680
Total cost price = Rs 8000 + 8000 = Rs 16000
Total selling price = Rs 8640 + 7680 = Rs 16320
Total gain = Rs 16320 - Rs 16000 = Rs 320
Gain = Rs 320