Riley$-$Dog Industries reported the following results from the sale of $7,600$ boxes of deluxe hair color in May: sales $$304,000$; variable costs $$182,400$; fixed costs $$60,000$; and net income $$61,600.$ Assume that Riley$-$Dog increases the selling price of its product by $10\%$ on June $1.$ How many boxes will have to be sold in June to maintain the same level of net income?