If a person get `1200Rs` return as amount (principal along with interest) by depositing `800Rs` in the bank at the rate of simple interest of `10%` per annum, then calculate the time for which the money was deposited in the bank.

Explanation

Here, principal `=800Rs`, Amount `=Rs1200`
`:.` Interest `=Rs(1200-800)=Rs400`
Let the required time `=t` years.
`:.(800xx10xxt)/(100)=400=timplies(400)/(80)=5`
`:.` The required time `=5` years.