Final answer:
To calculate the percentage loss, subtract the selling price from the initial cost, divide that difference by the initial cost, and multiply by 100. In this case, the percentage loss is C)25%.
Step-by-step explanation:
To calculate the percentage loss, we need to find the difference between the initial cost and the selling price, and then divide that difference by the initial cost. In this case, Cecil bought the camera for $120 and sold it for $90, so the difference is $120 - $90 = $30. To find the percentage loss, we divide the difference by the initial cost and multiply by 100: ($30 / $120) x 100 = 25%. Therefore, the correct answer is C) 25%.