Julian is selling Thingamajings at a farmer's market. Julian's market analyst, Josh, tells Julian that his weekly revenue can be calculated using

A$=2$n$^2+20$n$.$ As well, Josh tells Julian that Julian's weekly costs can be calculated using A$=-2$n$+36.$ Note: a is the amount of revenue$/$cost in dollars and n is hte number of Thingamajigs in $100$s$.$ a$.$ solve the system of equations using substitution.