Suppose Jim has a demand curve​ of: Upper Q Subscript d Superscript Upper J Baseline equals 8 minus p​, and Sam has a demand curve​ of: Upper Q Subscript d Superscript Upper S Baseline equals 6 minus 0.5 p. How much is the total demand at a price of ​$9.50​? nothing ​unit(s) ​(round your answer to two decimal​ places). How much is total demand at a price of ​$6.50​? nothing units ​(round your answer to two decimal​ places).