Lin paid 3.30 in sales tax on an item that cost 60 what percent sales tax did he pay

Plz me i need i will give a brain

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Hi my sisters and brothers can tell me the answer because i don’t understand the question