Amy, a scheduler at Mangel$-$Wurzel Transport, gets a call from a regular customer needing to move $11\mathrm{.}8m^3$ of rock and soil, which Amy knows from previous experience has an average density of $1290k\frac{g}{m^3}.$ Amy has available a dump truck with a capacity of $4m^3$ and a maximum safe load of $3600.kg.$ Calculate the number of trips the dump truck will have to make to haul the customer's load away.