Answer & Solution
Total number of students = 455030
Number of those choosing the given three subjects
= 15000 + 10000 + 15000
= 40000
∴ Required percentage
$$\eqalign{ & = \left(\frac{40000}{455030}\times100\right)\% \cr & = 8.79\% \cr & \approx 9\% \cr} $$