Ted Has Decided to Buy a Burger and Fries at a Restaurant

Multiple Choice

Ted has decided to buy a burger and fries at a restaurant, but is considering whether to buy a drink as well.If the price of a burger is $2, fries are $1, drinks are $1, but a value meal with all three costs $3.80, the marginal cost to Ted of the drink is:

A) $0.20
B) $0.80
C) $1.00
D) $3.80
E) impossible to determine from the above information.