Well, for five trips per year over a six year period, your 56K would earn: "For example, if you invest $1,000, the calculation would be A = 1000(1 + 0.04/1)^(1*6), which equals approximately $1,265.33. This means you would earn about $265.33 in interest over 6 years."
So 6 times $256.33 or...