Calculate the error and the percentage error

From the previous calculation, the error in the weight of the metal disc is the absolute uncertainty.

$$\text{Error} = \Delta M_d = 0.002 \, \text{g}$$

The calculated weight (mass) of the metal disc is the measured value.

$$\text{Measured Value} = M_d = 4.525 \, \text{g}$$

The percentage error is calculated using the formula:

$$\text{Percentage Error} = \frac{\text{Absolute Error}}{\text{Measured Value}} \times 100\%$$ $$\text{Percentage Error} = \frac{0.002 \, \text{g}}{4.525 \, \text{g}} \times 100\%$$ $$\text{Percentage Error} = 0.00044198895 \times 100\%$$ $$\text{Percentage Error} \approx 0.0442\%$$

The error is $\boxed{\text{0.002 g}}$ and the percentage error is \boxed{\text{0.0442%}}.