Tony spends $36 per month on cookies. For him, chocolate chipcookies and peanut butter cookies are perfect substitutes.Chocolate chip cookies are $4 per dozen and peanut butter cookiesare $3 per dozen.
a) What is Tony's marginal rate of substitution ofchocolate chip cookies for peanut butter cookies? (Assume that chocolate chip cookiesis the good X which is on the horizontal axis)
b) What is the slope of his budget line?
c) How many dozen of eachtype of cookie will Tony buy in a given month if he wants tomaximize his utility?