Walter used to work as a high school teacher for $40,000 per year but quit in order to start his own painting business. To invest in his painting business, he withdrew $20,000 from his savings, which paid 3 percent interest, and borrowed $30,000 from his uncle, whom he pays 3 percent interest per year. Last year Walter paid $25,000 for supplies and had revenue of $60,000. Walter asked Tyler the accountant and Greg the economist to calculate his painting business's costs.

a) Tyler says his costs are $25,900, and Greg says his costs are $66,500.
b) Tyler says his costs are $25,000, and Greg says his costs are $65,000.
c) Tyler says his costs are $66,500, and Greg says his costs are $66,500.
d) Tyler says his costs are $75,000, and Greg says his costs are $41,500.