A car is traveling up a 3% grade on a road that has good, wet pavement. The engine is running at 2500 rpm. The radius of the wheels is 15 inches, the driveline slipage is 3% and the overall gear reduction ratio is 2.5 to 1. A deer jumps out onto the road and the driver applies the brakes 291 feet from the deer. The cars' antilock braking system fails, the brakes immediately lock and the driver hits the deer at a spped of 20mi/h. If aerodynamic resistance is ignores, what is the braking efficiency?