Th owner must buy 7 Jackets
Step-by-step explanation:
a. Purchase price=$55 , Sell Price= $77
 Sell Price = $55+$22
          = Purchase price + 40*55/100
          =Purchase price + 40% of Purchase price
          =140% of purchase price
b. Purchase Price=$35
  Sell price=140%of $35
          =140*$35/100
          =$49
Number of Jackets required for the total sale to be $340 = $340/$49
                                                =6.94
So We get the result by rounding off because Jackets cannot be in fraction, which is 7