The given bar graph represents the number of students admitted in four schools (S1, S2, S3, S4) during two consecutive years 2017 and 2018.

What percentage is the average admission of schools S3 and S4 in 2018 of the average admission of schools S1 and S2 in 2017?

81.63%

Average admission of school S3 and  S4 = \(\frac{150+250 }{2}\)

= \(\frac{400 }{2}\)

= 200

Average admission of schools S1 and S2 in 2017 = \(\frac{250+240 }{2}\)

= \(\frac{490 }{2}\)

= 245

Required percentage = \(\frac{200 }{245}\) × 100

= 81.63%