if the cost of 5 books is 35 and the average price per book is reduced by 20% ,how much will the 5 books cost at the new rate

• ans 28
  7*(80/100)*5=28
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• cost of 5 books =35
  cost of 1 book=35/5=7
  cost of new avg =7-(7*20/100)=5.6
  new rate of 5 books=5.6*5=28
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