$1.$ In an Inventory spreadsheet, you copy a formula from cell B$2$ and paste it into D$9$ a$.$ What appears in cell D$9$ if the formula in B$2$ is $=$C$6+8?$

b$.$ What if the formula is $=$$C$$6+8$

c$.$What about $=$$C$6+8?$

d$.$ And $=$C$$6+8?$

$2.$ How would you calcualte the percentages in cells C$6$ through C$9$ without referring to the total in cell B$10?$