SOLUTION STEPS:
  1. Ray has 4 units = $408. So 1 unit (Elliot) = $408 / 4 = $102.
  2. Total money = $408 + $102 = $510. For equal shares, each gets $510 / 2 = $255.
  3. Ray must give $408 - $255 = $153 to Elliot.