Winnie Runs an Ice Cream Cooler at the Beach Each

Winnie runs an ice cream cooler at the beach each summer. Her brother doesn't charge her rent for setting up her ice cream cooler in his stand. Each bar of ice cream costs her $.20. She adds on an additional $.20 to each bar to pay for electricity for the freezer, napkins, and her time, selling the ice cream finally at $.40 per bar. Winnie uses

A) bundle pricing.
B) cost-plus pricing.
C) odd pricing.
D) markup pricing.