allery72-ৰ নিয়ম অনুসৰি, এটা বিনিয়োগ 9% সুতত প্ৰায় কিমান সময়ত দুগুণ হয়?
A9 বছৰ
B8 বছৰ
C6 বছৰ
D7 বছৰ
Answer & Solution
Correct answer: B. 8 বছৰ
72 / 9 = 8 years।
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