allery72-এর নিয়ম অনুসারে, 9% সুদে একটি বিনিয়োগ মোটামুটি কত বছরে দ্বিগুণ হয়?
A9 বছর
B8 বছর
C6 বছর
D7 বছর
Answer & Solution
Correct answer: B. 8 বছর
72 / 9 = 8 বছর।
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