Need help with gr 12 momentum question. Need answer asap. Please make sure ur answer is brief and you use gr 12 concepts so that its easier for me to understand. Tnx (Need answer asap)

A 0.57 kg bullet is shot horizontally out of a gun and travels at a speed of 308 mfs directly toward a 7.8 kg wooden block which sits on a frictionless horizontal surface. The bullet strikes the block and embeds itself within it, but does not pass through. If the wooden block starts at rest, what percentage of the kinetic energy of the system is lost in the collision? {Use g = 9.8m/52 and round answer to 1 decimal place)