Jena Runs an Ice Cream Cooler at the Beach Each

Jena runs an ice cream cooler at the beach each summer.Her brother does not charge her rent for setting up her ice cream cooler in his stand.Each bar of ice cream costs her $0.20.She adds an additional $0.20 to each bar to pay for electricity for the freezer,napkins,and her time,selling the ice cream finally at $0.40 per bar.Jena uses _____ pricing.

A) bundle
B) rate-of-return
C) odd-even
D) markup