Use the formula: [tex]\[\text{Percentage Error} = \left( \frac{|\text{Experimental Value} - \text{True Value}|}{\text{True Value}} \right) \times 100\%\][/tex]Steps: 1. Find the absolute error: - Subtract the true value from the experimental value and take the absolute value. 2. Divide by the true value: - Divide the absolute error by the true value. 3. Multiply by 100: - Convert the result into a percentage by multiplying by 100.