Final answer:
The number of students in the school is calculated by dividing the total enrollment fee by the average annual fee per student. With a 1% ESC of Rs. 1,10,250 and an average fee of Rs. 12,600, the school has 90 students.
Step-by-step explanation:
The question is asking to find out the number of students enrolled in a school if the school pays an education service charge (ESC) of Rs. 1,10,250 which is 1% of its annual enrollment fee. The average annual fee per student is Rs. 12,600.
To find the total enrollment fee, we will be using the following calculation:
- Total ESC = 1% of Total Enrollment Fee
 - Rs. 1,10,250 = 1% of Total Enrollment Fee
 - Total Enrollment Fee = Rs. 1,10,250 / 1%
 - Total Enrollment Fee = Rs. 1,10,250 / 0.01
 - Total Enrollment Fee = Rs. 1,10,25,000
 
Next, we find out the number of students by dividing the Total Enrollment Fee by the average fee per student:
- Number of Students = Total Enrollment Fee / Average Annual Fee per Student
 - Number of Students = Rs. 1,10,25,000 / Rs. 12,600
 - Number of Students = 875
 
Therefore, the correct answer is:(D) 90 students