ABC26GN4061 · Simple Interest
Subject: General Aptitude · Chapter: Simple Interest · Exam: 2006 · Marks: · Difficulty:
If the simple interest for 6 years be equal to 30\% of the principal, it will be equal to the principal after
(a)10 years
(b)20 years
(c)22 years
(d)30 years
Answer
Explanation
Let $\operatorname{sum}=₹ x$. Then, S.I. $=30 \%$ of $₹ x=₹ \frac{3 x}{10}$. Time $=6$ years. $$\therefore \quad \text { Rate }=\left(\frac{100 \times 3 x}{10 \times x \times 6}\right) \%=5 \%$$ Now, sum $=₹ x$, S.I. $=₹ x$, Rate $=5 \%$. $$\therefore \quad \text { Time }=\left(\frac{100 \times x}{x \times 5}\right) \text { years }=20 \text { years. }$$
Explanation as extracted from the printed page; notation may be imperfect.
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