Amalgamated Fenderdenter's sales are $10 million. The company spends $3.5 million for purchase of direct materials and $2.5 million for direct labor; overhead is $3.5 million and profit is $500,000. Direct labor and direct material vary directly with sales, but overhead does not. The company wants to double its profit.

By how much should the firm increase annual sales?

By how much should the firm decrease material costs?

By how much should the firm decrease labor cost?