Sales $(8,100$ units$)$ Variable expenses Contribution margin Fixed expenses Net operating income Required: $($ Consider each case independently $)$ Total $ $267,300145,800$ Per Unit $33\mathrm{.}0018\mathrm{.}00$ contribution margin $121,500$ per unit $15\mathrm{.}00$ fixied expenses $55,400$ net operating income $66,100$ What would be the revised net operating income per month if the sales volume increases by $30$ units? $2.$ What would be the revised net operatinglincome per month if the sales volume decreases by $30$ units? $3.$ What would be the revised net operating income per month if the sales volume is $7,100$ units $?1.$ Revised net operating income $2$ Revised net operating income $3.$ Revised net operating income