Peter is a retired army officer who is very good at finding truffle and premium mushrooms in the hills of Tuscany. He estimates the next best use of his time for searching, picking, and delivering truffle and mushrooms at $1.50 per kilo. The restaurants he supplies are willing to pay Peter $7 per kilo. What is the excess profit appropriated by Peter?

options:

$ 1.50

$ 5.50

$ 7.00

$ 8.50