ক এর লাইব্রেরীতে ৬টি শেলফ আছে । যে দুটি শেলফ -এ সমাজবিজ্ঞানের বই আছে সেগুলোর প্রতিটিতে ৯০ টি করে বই আছে। বাকি শেলফগুলোর প্রতিটিতে ৮০ টি করে বই আছে। ক এর লাইব্রেরীতে কত শতাংশ বই সমাজবিজ্ঞান ?
A. 42%
B. 40%
C. 32%
D. 36%
সঠিক উত্তরঃ
D.
36%
Explanation:
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