Cullumber Company reports the following inventory data for the month of June:

June $1$ to $30$

Direct materials

$$81$ to $$110$

Work in process

$180$ to $220$

Finished goods

$230$ to $270$

$1.$ Direct materials purchases were $$160.$

$2.$ Direct costs of production were $$220.$

$3.$ Variable costs of production were $$280.$

$4.$ Indirect costs of production were $$230.$

$5.$ Selling and administrative costs were $$260.$

$($a$)$ What were the total costs of production?