Answer:
40%
Explanation:
To start off, we are going to place the number of movies he thought were very good, over the movies he watched over the entire year into a fraction (or a certain number over the total amount)!
18/45 or

Next, we are going to place this into our calculator and will get a decimal value.
18/45 → 0.40
Last, we are going to change this number into a percentage, by multiplying our decimal by 100.
0.40 → 40%
Hope this Helps! :)
Have any questions? Ask below in the comments and I will try my best to answer.
-SGO