Answer and Step-by-step explanation: Marginal Benefit is the maximum a person is willing to pay for an additional good or service. It can be calculated as:
![marginal=(Change total benefit)/(Change quantity)](https://img.qammunity.org/2021/formulas/mathematics/college/zcrgbmq6wtvtm4u1lwqnllpitnsmhfxyit.png)
For each cup of coffee:
For the first cup, benefit is $8;
For the second:
![marginal=(14-8)/(2-1)](https://img.qammunity.org/2021/formulas/mathematics/college/ld5y82sa4e68yp70wdpum33ma6dyzfne56.png)
marginal = 6
For the third:
![marginal=(18-14)/(3-2)](https://img.qammunity.org/2021/formulas/mathematics/college/b417x9fmx7u1avx2np018vaf9q0we5a23a.png)
marginal = 4
For the fourth:
![marginal=(20-18)/(4-3)](https://img.qammunity.org/2021/formulas/mathematics/college/8c4unq4c46xzrszg2vshbeexg69wkjvd6b.png)
marginal = 2
For the fifth:
![marginal=(21-20)/(5-4)](https://img.qammunity.org/2021/formulas/mathematics/college/5mhrq6yunnu1n3m7fzto4twe0jtgkx0wym.png)
marginal = 1
The cost of the coffe is $3, so comparing benefit and cost, Neal should consume 4 cups of cofee per day.