The nutrition label on a snack bar, which costs $1.00, reads - Serving size 42 g; Calories

Question:

The nutrition label on a snack bar, which costs $1.00, reads - Serving size 42 g; Calories Per Serving 180. Determine
(a) The heating value in MJ/kg.
(b) Price in cents per MJ of heat release.
(c) If gasoline with a heating value of 44 MJ/kg and a density of 750 kg/m3 costs $2.50 a gallon, what is the gasoline price in cents/MJ?