Mahan Corporation ended the year with $70,000 of sales and $35,000 of net assets. The corporation's managers forecast that sales will increase by 10% in the coming year. The corporation has reinvested earnings of $2,000. Assuming the ratio of net assets to sales remains constant, the corporation's required external financing will be _____.

a. $5,500

b. $3,300

c, $1,500

d. $1,000