Bela started studying how the number of branches on her tree grows over time. Every $2.9$ years, the number of branches increases by an additional $83\%$, and can be modeled by a function, $N$, which depends on the amount of time, $t$ (in years). When Bela began the study, her tree had $60$ branches. **Write a function that models the number of branches $t$ years since Bela began studying her tree.** $N(t) = $ [[☃ expression 1]]