## at a certain middle school, the 6th-grade class of 390 increased by 10%, the 7th grade class of 350 increased by 22%, and the 8th grade clas

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## Answers ( No )

The overall percentage of increase of students for this middle school is about 17.2%

To do this you have to know the number of students in each grade and add them together and do this:

390 x 0.1 = 39 Students

350 x 0.22 = 77 students

420 x 0.2 = 84 students

Add all the number of students and do this:

(200 students over 1,160) x 100%

(Increased students over original students) x 100%

0.172 x 100% = 17.2%

The percentage increase of the students of the middle school is about 17.2%