What time period will yield the same interest as 10000 rupees at 10% for 20 years, when invested at 8% on 25000 rupees?

Q.What time period will yield the same interest as 10000 rupees at 10% for 20 years, when invested at 8% on 25000 rupees? (a) 8 years (b) 10 years (c) 12 years (d) 15 years

Answer: B

According to the problem, \(\cfrac{25000\times t\times 8}{100}=\cfrac{10000\times 20\times 10}{100}\)
or, \(t=\cfrac{10000\times 20\times 10}{25000\times 8}\)
or, \(t=10\) years.