Selling Price after a 28% Markup is applied to an item that Cost $210

Given: Cost = $210,  Markup = 28%
Markup as a Decimal: 28% = 0.28
Formula:
Selling Price = Cost * (1 + Markup as a Decimal)
Selling Price = $210 * (1 + 0.28)
Selling Price = $210 * 1.28
Selling Price = $268.80
Notes:
Markup Amount = Selling Price – Cost = $268.80 – $210 = $58.80
Profit = Markup Amount = $58.80
Profit Margin =   =   = 0.2188 = 21.88%