Carla takes a car to a title loan business to borrow some money. Carla is given $$3,400\mathrm{.}00.$ She must pay back the $$3,400\mathrm{.}00$ in addition to a $$1,200\mathrm{.}00$ fee in $2$ months. What simple interest rate is she being charged?

Round to the nearest tenth of a percent

Carla is being charged a simply interest rate of $8\%.$