Javascript bank - need help with depositing money function

gistfile1.txt

//create bank //

const bank = [
  {name: 'Melanie Sills',
  currentBalance: 500
  },

  {name: 'Susan Oram',
  currentBalance: 100
  },

  {name: 'Paul Adams',
  currentBalance: 500
  },
  {name: 'Brendan Bullock',
  currentBalance: 10
  }
];

//DEPOSITING MONEY!!//

const deposit = function(money) {
     bank[1].currentBalance += money;
    return bank[1].currentBalance;
};
  deposit(10);



//function to sum up account balances

let summingBank = function(bank) {
  let bankSum = 0;
  for (var i = 0; i < bank.length; i++) {
    bankSum += bank[i].currentBalance;
  }
  return bankSum;
};
console.log(summingBank(bank));

//function to add new account

let addAccount = function(newName, newBalance){
  bank.push({
    name: newName,
    currentBalance: newBalance,
    depositWithdraw: ''
  })
return bank;
};
addAccount("Atsuko Wantanabe", 1000);
addAccount("Brenda Barr", 10);