First, we need to define our terms.
Mark up = Retail - Cost ÷ Retail
Mark on = Retail - Cost ÷ Cost
Your request includes both ideas, so let's calculate both types.
1. Mark up = $1979 - 1430 ÷ 1979 x 100% = 28.2%
2. Mark on = $1979 - 1430 ÷ 1430 x 100% = 38.4%