Solve it ( i'll select u as brainliest )

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.

The answer is 90 % because since 20 multiplied by 5 is 100 you would have to do each question multiplied by 5 so 18 times 5 equals ninety percent.