Can you paraphrase this? "The percentage error for the comparisons would be affected if the value of g used in the calculation is different from the actual value of g at the place where the experiment is performed. The percentage error is calculated as the difference between the experimental and theoretical values, divided by the theoretical value, and multiplied by 100. If the value of g used in the calculation is not accurate, then the experimental values would be different from the actual values, and hence the percentage error would be affected."