money becomes four times in 10 years if it gets doubled in 5 years. Of these statements,
(a)1 and 3 are correct
(b)2 alone is correct
(c)3 alone is correct
(d)2 and 3 are correct
Answer
Answer (as printed):
Explanation
Suppose sum $=x$. Then, S.I. $=x$ and Time $=5$ years. Rate $=\left(\frac{100 \times x}{x \times 5}\right) \%=20 \%$. Now, sum $=x$, S.I. $=3 x$ and Rate $=20 \%$. ∴ Time $=\left(\frac{100 \times 3 x}{x \times 20}\right)$ years $=15$ years (False) So, 2 alone is correct.
Explanation as extracted from the printed page; notation may be imperfect.