Final answer:
Jon charges $3 for a hamburger as indicated by the function d=3h+8, and for Alphonso, the true cost of an additional burger is the opportunity cost of four bus tickets.
Step-by-step explanation:
The question pertains to the concept of opportunity cost in economics. The function d=3h+8 represents Jon's hamburger stand revenue function where d is the number of dollars in the register, and h is the number of hamburgers sold. Each hamburger is sold for $3.
Considering Alphonso's budget constraint, the true cost of an additional burger is not just the monetary value, but the number of bus tickets he has to forgo. Given that bus tickets cost $0.50 each, for Alphonso to afford one more burger, he would need to give up four bus tickets. This tradeoff between burgers and bus tickets demonstrates the concept of opportunity cost.