Jesus is 100% man. He had to be if He was going to pay the price for our sins. When Adam and Eve sinned in the garden, it was promised that the seed of the woman would come and deliver them from the power of the serpent. The Redeemer had to be next of kin in order to meet the qualifications of redemption.
Jesus is 100% God. He had to be if He was going to pay the price for our sins. If He wasn't God, and He managed to live a perfect life, then He could only die for one person. Only God could be the sacrifice for all of mankind for all time. His deity is necessary if He is to be the Savior of the world.