John invested a sum of money at an annual simple interest arte of 10%. At the end of four years the amont invested plys interest earned was 770. The a

Question

John invested a sum of money at an annual simple interest arte of 10%. At the end of four years the amont invested plys interest earned was 770. The a

John invested a sum of money at an annual simple interest arte of 10%. At the end of four years the amont invested plys interest earned was 770. The amount =invested was:(जॉन ने एक धनराशि को 10 % वार्षिक साधारण बियाज की दर से निवेशित किया। चार वर्षो बाद राशि, बियाज सहित रुपया 770 हो जाता है तदनुसार वह कितने थी )
A. 650
B. 3.5
C. 550
D. 500

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

(c ) Let the amount invested(माना की निवेश की शेष राशि) =Rs P
Accordingt to the question, `P+(Pxx10xx4)/(100)=770`
`P+(4P)/(10)=770`
`(14P)/(10)=770 Rightarrow P =(770xx10)/(14)=550`
Hence Required invested amount(तक)=550
Alterante (वैकल्पिक विधि )
`10%=(1to "Interest")/(10to"Principal")`
Interest in 4 years=`1xx4=4`
`"Amount"=("interest"+"principal")=4+10=14`
According to the question,
14units=770
`1 "units"=(770)/(14)xx10=550`
The amount invested =550