How do I find the percentage of two column data table?

Answer:
a) 47.7%
b) 87.2%
Step-by-step explanation:
Find the ratio of interest, and convert it to a percentage.
(messy right-handed writers)/(right-handed writers)
= 31/65 = 31/65 × 100% ≈ 47.7%
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(neat right-handed writers)/(neat writers)
= 34/39 = 34/39 × 100% ≈ 87.2%