Use the demand curve below to answer questions 7 through 10. What is the marginal value at a quantity of 4000?

Use the demand curve below to answer questions 7 through 10. 0.9 0.8 0.7 0.6 Price 0.5. 0.4 0.3 0.2 0.1 0+ 0 1000 2000 3000 4000 5000 6000 7000 8000 Quantity What's the marginal value at a quantity of 4,000