Simplify this: In a shop the price of a torch is 1500. During promotion the price reduced to 1350. Calculate the percentage (%) decrease in the price of the torch.

The decrease in price is the original price minus the new price.
Decrease = Original Price - New Price
Decrease = $1500 - 1350 Decrease = 150

Percentage decrease is calculated by dividing the decrease in price by the original price and multiplying by 100%.
Percentage Decrease = $\frac{\text{Decrease}}{\text{Original Price}} \times 100\%$
Percentage Decrease = $\frac{150}{1500} \times 100\%$
Percentage Decrease = $0.1 \times 100\%$
Percentage Decrease = $10\%$

The percentage decrease in the price of the torch is 10%.