An unpeeled banana will unlikely grow mold faster than a sandwich. A peeled banana will likely grow mold faster than a sandwich due to higher sugar content and moisture. However, it also depends on the conditions. Fridge vs. counter top, arid climate vs. moist, etc.
Mold
Strawberries usually grow mold the fastest on the leaves, but it also grows on the older spots of the strawberry. (Or the rotted part.)
cabinets
Bread mold grows incredibly fast. Strawberries and tomatoes are also easy to become moldy.
Because they are nice fat and juicy
Mold will grow faster on white bread.
faster
the reason soda makes mold grow faster is because soda is high in sugar and sugar is food for mold.
Mold thrives in warmer temperatures; therefore the mold will grow faster at room temperature.
Coke would make mold grow faster... Sugar is food for the mold/fungus. Therefore, Coke with its high sugar content would make it grow faster.
The strawberry will mold faster than the grape, I don't know why exactly, but I just know it does.