I bought a television for #600 and sold it for #820. What was my percentage loss or gain

To calculate the percentage gain or loss, you need to find the difference between the selling price and the cost price, and then divide that difference by the cost price. Finally, multiply the result by 100 to get the percentage.

Given:
Cost Price = £600
Selling Price = £820

Percentage Gain or Loss = ((Selling Price - Cost Price) / Cost Price) * 100

((£820 - £600) / £600) * 100
= (£220 / £600) * 100
= 0.3667 * 100
= 36.67%

Therefore, the percentage gain or loss is 36.67%.