State the most suitable data type for the following variables used in the algorithm described in Figure 1.

Figure 1

cartTotal ← USERINPUT
membershipYears ← USERINPUT
discountPercent ← 0.0
statusText ← "Non-member rate applied"
errorMsg ← "Invalid cart amount"
IF cartTotal > 0.0 THEN
    IF membershipYears >= 3 THEN
        discountPercent ← 15.5
        OUTPUT discountPercent
    ELSE
        OUTPUT statusText
    ENDIF
ELSE
    OUTPUT errorMsg
ENDIF