*USE R programming

. Please convert the scores of the three examinations into a 100- point scale (currently 0-20 points), and according to the first stage test (G1) accounting for 30%, the second stage test (G2) accounting for 30% and the final test (G3) Account for 40% of the distribution, and calculate the semester grade (final_score, converted to a 100-point scale, please round to 1 decimal place)