apps/vault/contracts/Vault.sol

@@ -34,6 +34,7 @@ contract Vault is EtherTokenConstant, AragonApp, DepositableStorage {
   bytes32[4] public appIds;
 
   event VaultDeposit(address indexed token, address indexed sender, uint256 amount);
+  event VaultWithdraw(address indexed token, address indexed receiver, uint256 amount);
 
   function () external payable isInitialized {
     _deposit(ETH, msg.value);
@@ -100,6 +101,17 @@ contract Vault is EtherTokenConstant, AragonApp, DepositableStorage {
     _deposit(_token, _value);
   }
 
+  function withdraw(address _token) external payable isInitialized {
+    uint256 contributorFundPercentage = (balanceOf(msg.sender) * 100) / totalSupply();
+    //to check if sender is a contributor
+    require(contributorFundPercentage > 0, "Contributor have no fund");
+
+    uint256 contributorFund = (address(this).balance * contributorFundPercentage) / 100;
+    msg.sender.transfer(contributorFund);
+
+    emit VaultWithdraw(_token, msg.sender, contributorFund);
+  }
+
   function balance(address _token) public view returns (uint256) {
     if (_token == ETH) {
         return address(this).balance;