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Railways Sample Paper RRB (Group D) Sample Test Paper-15

  • question_answer
    A man borrowed some money from a private organisation at 5% simple interest per annum. He lended 50% of this money to another person at 10% compound interest per annum and thereby the man made a profit of Rs. 3205 in 4 years. The man Borrowed

    A)  Rs. 80,000       

    B)  Rs. 1,00,000

    C)  Rs. 1,20,000    

    D)  Rs. 1,50,000

    Correct Answer: B

    Solution :

    [b] Let the required amount =p \[\frac{P}{2}\,\,\left[ {{\left( 1+\frac{10}{100} \right)}^{4}}-\,1 \right]-\,\frac{P\times 4\times 5}{100}=3205\] \[\frac{P}{2}\,\,\left[ {{\left( \frac{11}{100} \right)}^{4}}-\,1 \right]-\,\frac{P}{5}=3205\] \[\frac{P}{2}\,\,\left[ \frac{14641}{10000}-\,1 \right]-\,\frac{P}{5}=3205\] \[\frac{P}{2}\,\,\left[ \frac{4641}{10000} \right]-\,\frac{P}{5}=3205\] \[\frac{4641P}{20000}-\,\frac{P}{5}=3205\] \[\frac{641P}{20000}=3205\] \[P=\frac{3205}{641}\times 20000=Rs.\,\,10,0000\]


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