Last month a manager$$s operation achieved $$60,000$ in food sales and $$40,000$ in beverage sales. The manager$$s cost of sales for food was $$15,000$ and cost of sales for beverages was $$8,000.$ What was the manager$$s cost of sales percentage for food last month?

Group of answer choices

$20\%$

$35\%$

$30\%$

$25\%$