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Question

Hasib took a loan of 1400 tk with simple interest for as many years as the rate of interest. If he paid 126 th as interest at the end of the loan period , what was the rate of interest?

12%

None of these

ANSWER : 1

Descrption

Let rate = R% and time = R years 
Then &lt;math xmlns = &quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mfenced&gt;&lt;mrow&gt;&lt;mo&gt;&amp;#xA0;&lt;/mo&gt;&lt;mfrac&gt;&lt;mrow&gt;&lt;mn&gt;1 
400&lt;/mn&gt;&lt;mo&gt;&amp;#xA0;&lt;/mo&gt;&lt;mo&gt;&amp;#xD7;&lt;/mo&gt;&lt;mo&gt;&amp;#xA0;&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;&amp;#xD7;&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;100&lt;/mn&gt;&lt;/mfrac&gt;&lt;/mrow&gt; 
&lt;/mfenced&gt;&lt;/math&gt; = 126 
&lt;math xmlns = &quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mo&gt;&amp;#x21D2;&lt;/mo&gt;&lt;mn&gt;14&lt;/mn&gt;&lt;msup&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; = 126 
&lt;math xmlns = &quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;msup&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; = 9 
&lt;math xmlns = &quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mo&gt;&amp;#x2234;&lt;/mo&gt;&lt;/math&gt; R = 3

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