Question

in how many years Will a sum of money double itself at 10%p.a. simple intrest

Answer 1

Let Sum of money(Principal)be=₹100
Rate=10%
LET time ne=x years

A/q
Sum of money will double
Mean ₹100×2=200
Amount =₹200
SI=200-100
SI=₹100

SI=₹100

We know that
$si = \frac{p \times r \times t}{100} \\ 100 = \frac{100 \times 10 \times x}{100} \\ 100 = 10x \\ x = \frac{100}{10} \\ x = 10years \\ \\ time = 10 \: years$