Table $13-10$ $$600$ a month and has leased computer equipment that costs $$480$ a month.

$\backslash$table$[[\backslash$table$[[$Output$],[($Instructional$],[$modules per$],[$month$)]],\backslash$table$[[$Fixed$],[$Cost$],[($Dollars$)]],\backslash$table$[[$Variable$],[$Cost$],[($Dollars$)]],\backslash$table$[[$Total$],[$Cost$],[($Dollars$)]],\backslash$table$[[$Marginal$],[$Cost$],[($Dollars$)]],\backslash$table$[[$Average$],[$Fixed Cost$],[($Dollars$],[$per unit$)]],\backslash$table$[[$Average$],[$Variable$],[$Cost$],[($Dollars per$],[$unit$)]],\backslash$table$[[$Average$],[$Total Cost$],[($Dollars$],[$per unit$)]]],[0,1,080,,,,,,],[1,1,080,400,1480,400,,,],[2,,,,450,,,],[3,,1,350,2,430,,,,],[4,,1,900,,,,475,],[5,,2,500,,,216,,],[6,,,4,280,700,,,],[7,,4,100,,,,,],[8,,5,400,,,135,,],[10,,7,300,,,,,]]$

Refer to Table $13-10.$ What is the average variable cost for the month if $6$ instructional modules are produced?

Select one:

a$.$ $$700\mathrm{.}00$

b$.$ $$180\mathrm{.}00$

C$.$ $$533\mathrm{.}33$

d$.$ $$713\mathrm{.}33$