State why both BASE_FEE and BOOKING_FEE from the algorithm in Figure 3 did not need to be included in a trace table.

Figure 3

constant BASE_FEE ← 15
constant BOOKING_FEE ← 3
OUTPUT 'Enter money paid'
payment ← USERINPUT
totalCost ← BASE_FEE + BOOKING_FEE
ticketsBought ← 0
REPEAT
    payment ← payment - totalCost
    ticketsBought ← ticketsBought + 1
UNTIL payment < totalCost