x ও y এর গুণফল একটি নির্দিষ্ট সংখ্যা। x এর মান বৃদ্ধি করা হলে গুণফল অপরিবর্তিত রাখতে y এর মান শতকরা কত ভাগ হ্রাস করতে হবে?
A.
B. ২৫%
C. ১০%
D. ৩৫%
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সঠিক উত্তরঃ
B.
২৫%
Explanation:
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