i need number 7 done a,b,c and d. step by step please (will give brainliest)

Answer:
a) 64 : 13
b) 1.5×10⁹
c) China➛ 18.2%
India➛ 44.7%
US➛ 25.0%
Bulgaria➛ -19.1%
India, United States, China, Bulgaria
d) No, I do not agree. (see picture for justification)
Step-by-step explanation:
Please see the attached pictures for full solution.