Chefs sak and Arna were competing in a final duel for the title "the best chef in Iceland". They were asked to cook three dishes and present them to the jury. The jury gave each correct score (on a scale of 0-20) for taste, presentation and originality. The scores were used to calculate the overall score, but the scores obtained for the dishes had different weights: The points obtained for the starter scored 29% of the total score. The points obtained for the main course scored 48% of the total score. The points obtained for the desert scored 23% of the total score. The table shows the points obtained for each item (taste / presentation / originality) in each dish.

saks scores

Taste = Starter 17, Main course 18, Desert 15

Looks = Starter 18, Main course 18, Desert 18

Originality = Starter 19, Main course 16, Desert 19

Arna scores

Taste = Starter 17, Main course 16, Desert 19

Looks = Starter 15, Main course 16, Desert 19

Originality = Starter 18, Main course 18, Desert 19

a) What was Isaac's overall score for all the dishes? Answer with 1 decimal place (note not close until the end). b) What was Arna's overall score for all the dishes? Answer with 1 decimal place. c) Which of them had a higher overall score and won the title "Iceland's best chef"?