If Rohan paid Rs. 120 each for 20 books, Rs. 150 each for 15 books, and Rs. 100 each for 30 books, then find the average cost price per book.

Correct option is A

Ans. Rs. 117.69
Sol.
To calculate the average cost price per book, we use:
Average Cost= Total Cost​ / Total Number of Books
Step 1: Compute total cost for each category of books
1. 20 books at Rs. 120 each:
120×20=2400
2. 15 books at Rs. 150 each:
150×15=2250
30 books at Rs. 100 each:
100×30=3000
Step 2: Compute total cost and total number of books
Total Cost=2400+2250+3000=7650
Total Books=20+15+30=65
Step 3: Compute the average cost price per book
Average Cost = 7650 /65 =117.69
Thus, the correct answer is Rs. 117.69, which is not listed in the given options. ​​