Is there a way to get local state variables to be unique for different
objects? See my example bank account:

class Acc
  @@balance = 100
  def withdraw( amount )
    if @@balance >= amount
      @@balance = @@balance - amount
    else
      "Insufficient Funds"
    end
  end
  @@balance
end

irb(main):012:0> check1 = Acc.new
=> #<Acc:0xb7dc2f14>
irb(main):013:0> check1.withdraw 50
=> 50
irb(main):014:0> check1.withdraw 40
=> 10
irb(main):015:0> check1.withdraw 25
=> "Insufficient Funds"

This is great - but if I create a new object 'check2' it doesn't start
with a new balance of 100. What am I doing wrong here?

irb(main):016:0> check2 = Acc.new
=> #<Acc:0xb7db08c8>
irb(main):017:0> check2.withdraw 40
=> "Insufficient Funds"
I wanted this to return 60
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