Chin purchases five protein bars at a price of $3 each. The marginal benefit he receives from each bar is $5 for the first bar, $4.50 for the second bar, $4 for the third bar, $3.50 for the fourth bar, and $3 for the fifth bar. The marginal cost of producing the bars is $2 each. What is Chin's total consumer surplus from the five bars that he purchased