alleryसरळ व्याजाने, एखादी रक्कम 8 वर्षांत दुप्पट होते. वार्षिक दर आहे:
A8%
B12.5%
C10%
D15%
Answer & Solution
Correct answer: B. 12.5%
1. दुप्पट होणे म्हणजे मिळालेले व्याज हे मूळ मुद्दलाएवढे असते.
2. मुद्दल 100 मानल्यास, 8 वर्षांतील व्याजही 100 असले पाहिजे.
3. सरळव्याजानुसार 100 x R x 8 / 100 = 100.
4. म्हणून 8R = 100, म्हणजेच R = 12.5.
5. हा दर दरसाल 12.5 टक्के आहे. लक्षात घ्या की हे केवळ सरळव्याजासाठी लागू होते; चक्रवाढ व्याजाच्या बाबतीत ही रक्कम लवकर दुप्पट होईल.
_Source: syllabus Maths, Ch 7 'Comparing Quantities', S7.4 Compound Interest_
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