Question

R
7. At what rate of interest will a sum of
2
money double itself in 16 – years?
3​

Answer 1

Answer:

interest is to become equal to the principal in 16 years.

Suppose principal =Rs.100

Interest=Rs.100

R=

P×T

SI×100

=

100×16

100×100

=

4

25

=6

4

1

%

Answer 2

Answer:

Here, interest is to become equal to theprincipal in 16 years.

Suppose principal =Rs.100

Suppose principal =Rs.100Interest=Rs.100

principal in 16 years.

principal in 16 years.Suppose principal =Rs.100

principal in 16 years.Suppose principal =Rs.100Interest=Rs.100

$R= \: \frac{SI \: × \: 100}{SI×100} = \: \frac{100 \: \times \: 100}{100 \: \times \: 16} = \frac{25}{4} = \: 6 \frac{1}{4} \%$