Discount Electronics buys stereos for $$830$ less $37\mathrm{.}5\%$ and $12\mathrm{.}5\%.$ Expenses are $20\%$ of cost and the required profit is $15\%$ of the regular selling price. All merchandise is marked with a price so that the store can advertise a discount of $30\%$ while still maintaining its regular markup. During the annual clearance sale, the new regular selling price of unsold items is marked down $50\%.$ What operating profit or loss does the store make on items sold during the sale?