Tupac Arb

Tupac sees two banks: BofA and LigmA. BofA and LigmA offer annual interest rates of $r_1$ and $r_2$, respectively, where $0 < r_1 < r_2$. Assuming Tupac starts with $€0$, has a borrowing limit of $€1$, and interest compounds continuously, find the most amount of money he is guaranteed to make in $1$ year when $r_i = 0.03i$, $i = 1,2$. Round to the nearest cent. If there is no strategy that guarantees Tupac to make money, answer $-1$.