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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. 650B. 3.5C. 550D. 500 |
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Answer» (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 |
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