allery72 के नियम के अनुसार, 9% ब्याज दर पर कोई निवेश लगभग कितने वर्षों में दोगुना हो जाएगा?
A9 वर्ष
B8 वर्ष
C6 वर्ष
D7 वर्ष
Answer & Solution
Correct answer: B. 8 वर्ष
72 / 9 = 8 वर्ष।
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