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Question
একই সুদে ৫০০ টাকার ৪ বছরের সুদ এবং ৬০০ টাকার ৫ বছরের সুদ একত্রে ৪০০ টাকা হলে সুদের হার কত?
১২%
১০%
৮%
৬%
ANSWER : 3
Descrption
<pre> ধরি, সুদের হার r ∴ 500<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>×</mo><mn>4</mn><mo>×</mo><mfrac><mi>r</mi><mn>100</mn></mfrac><mo> + </mo><mn>600</mn><mo>×</mo><mn>5</mn><mo>×</mo><mfrac><mi>r</mi><mn>100</mn></mfrac><mspace linebreak = "newline"/><mo> = </mo><mn>400</mn><mspace linebreak = "newline"/><mo>⇒</mo><mn>20</mn><mi>r</mi><mo> </mo><mo> </mo><mo> + </mo><mn>30</mn><mi>r</mi><mo> </mo><mo> = </mo><mn>400</mn><mspace linebreak = "newline"/><mo>⇒</mo><mn>50</mn><mi>r</mi><mo> </mo><mo> = </mo><mn>400</mn><mo> </mo><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo> </mo><mi>r</mi><mo> = </mo><mn>8</mn></math> </pre>
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