If principal amounts double in `10` years, then the rate of yearly simple interest is

Options

A. `5%`
B. `10%`
C. `15%`
D. `20%`

Explanation

Let the principal be `Rs x` and the yearly rate of simple interest be `r%`
If the principal amounts `Rs 2x` in `10` years,
then the interest `=Rs(2x-x)=Rs x`
`:.` Total interest in `10` years `=(P rt)/(100)=Rs(x xx rxx10)/(100)=Rs(x r)/(10)`
`:.(xr)/(10)=ximpliesr=(x xx10)/(x)=10`
`:.` Rate of yearly simple interest `=10%`