In two successive years 100 and 75 students of a school appeared at the final ex

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In two successive years 100 and 75 students of a school appeared at the final examination. Respectively, 75% and 60% of them passed. The average rate of pass is

Options:

A . 80$1/2$%

B . 78%

C . 80%

D . 68$4/7$%

Answer: Option D
Answer: (d)Number of students passed in first year = 75Number of students passed in second year = ${60 × 75}/100 = 45$Total number of passed students = 75+45=120Total number of appeared students =175∴ Required percentage = $120/175 × 100 = 68{4}/7%$

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