Share or get killed

5 sea pirates have 100 gold coins and want to share it. They propose a plan. The senior most one has to propose an idea, if at least 50 % agree, the coins r shared accordingly. else the senior is killed and the next senior most is asked to present a plan and so on .note, all the guys r very clever and very greedy and dont want to lose the coins, and dont want to die. Form a way to share the money.