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400 रु की राशि 4 वर्ष में 480 हो जाती है...

400 रु की राशि 4 वर्ष में 480 हो जाती है यद ब्याज की दर 2% बड़ा दी जाये तो नया मिश्रधन बताए

A

484

B

560

C

512

D

None of these

लिखित उत्तर

Verified by Experts

The correct Answer is:
C

(c ) Principal=400,
Amount-480 Simple Interest=(480-400)=80
Time=4years
`Rate%=(SIxx100)/(PxxT)`
`Rate%=(80xx100)/(400xx4)=(8000)/(1600)=5%`
New rate of internet =(5+2)=7%
Interest=`(400xx7xx4)/(100)=112`
Hence amount=(400+112)=512
Alternnate /(वैकल्पिक विधि)
Note :- In such type of questions to save your valueable time follow the given below method (इस प्रकार के प्रशनो बहुमूल्य समय के बचत के लिए आप नीचे दी गयी विधि का प्रयोग कर सकते है) Increased in rates (दरो का वृद्धि) = `4xx2=8%`
Hence increased in amount(इसलिए दूसरा भाग) = `400xx8/100=32`
Hence new amount(नया मिश्रनघन)
₹(480+32)= ₹ 512
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