Step-by-step explanation:
2) Cost Price = CP = $ 35
Tax = $ 3.29
Tax percent = 
          
          = 9.4 %
Total amount paid by Ian = CP + tax = 35 + 3.29
                     = $ 38.29
3) Price of the order = $ 56.50
Shipping cost % = 3 % = 0.03
Shipping cost = price of the order * shipping cost %
            =  56.5 * 0.03
            =  1.695
            = $ 1.70
Total cost = Price of the order + Shipping cost
        = 56.5 + 1.70
        = $ 58.20
4) Bill amount = $ 26
Tip % = 18%
Tip amount = Tip % * bill amount
          
          = $ 4.68
5) commission% = 3.5 %
Commission amount = commission% * Sales
                  
                 = $ 1750
Base salary for a week  = $400
Base salary  for two weeks = 400 * 2 = $ 800
Emmett's earning for this two weeks period = Base salary for two weeks + commission
= 800 + 1750
= $ 2550
6) Tax % = 10.25 %
Purchase amount = $ 310.50
Tax = Tax% * Purchase amount
   
   = $ 31.83
Total = Purchase amount  + Tax
     = 310.50+ 31.83
     = $ 342.33
