Question

FIRST ANSWER-ER GETS BRAINLIEST

Answer 1

She is not correct
20% of 15 is 3
You add 3 hours =add 20%
15 =100%
3=20%
18=120%
But it is not 120% more than 15.
It is 120% of 15
She worked 20% more

Answer 2

That is correct. Since there are 168 hours in a week, 15 hours would be .09%, and 18 hours would be 0.11%. In proportion, 0.11 is .2 more than .09, which is equivalent to saying 120%.