In the seventh grade, rachel read 15 books. in the eighth grade, she read 18 books. find the percent of increase in the number of books rachel read.
a.
30%
c.
20%
b.
3%
d.
18%

The correct answer is 20% because the formula is change/original. The change between 18 and 15 or the difference is 3. so it is 3/15 because 15 is the original number of books that she read. The answer is 20%

The answer is c. 20% of 15 is 3. 15+3=18

The correct answer is addition