Simple interest on a loan

Statement

Marta lends a friend $2000\ \text{€}$ at a simple interest rate of $9\%$ per year, to be repaid after $8$ months. How much interest accrues?

Solution

With simple interest $I = C\cdot r\cdot t$, where time is in years: $t = \dfrac{8}{12}$. $I = 2000\cdot 0{.}09\cdot \frac{8}{12} = \boxed{120\ \text{€}}.$