Tundra Digital is putting together its R&D budget for the coming year. The firm has compiled a list of potential research and development projects and estimated the interest rate and amount of financial capital required for various levels of R&D spending. The data collected is shown in the table below. Graph the demand curve for Tundra Digital that includes the spillover benefits society enjoys from the company's investment in R&D.

Point Interest Rate Dprivate (in millions) Dsocial (in millions)
A 9% $3 $4
B 8% $4 $5
C 7% $5 $6
D 6% $6 $10
E 5% $9 $15