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The Wedding Shower Gift -Math riddle

63.Math Riddles
Janie's friends were chipping in to buy her a wedding shower present. At first, 10 friends chipped in, but 2 of them dropped out. Each of the 8 had to chip in another dollar to bring the amount back up. How much money did they plan to collect?
      Explanation :  
      $40 (10 at $4, or 8 at $5)