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Kerem makes candles. If he charges $25 for each candle, his total revenue will be

A. $1,250 if he sells 100 candles.
B. $625 if he sells 25 candles.
C. $25 regardless of how many candles he sells.
D. $2,500 if he sells 5 candles.

The Bow Wow company produced and sold 400 dog beds. The average cost of production per dog bed was $40. Each dog bed can be sold for a price of $75. Bow Wow's total costs are

A. $17,500.
B. $16,000.
C. $30,000.
D. $46,000.

Tiana sells 275 candy bars at $0.50 each. Her total costs are $125. Her profits are

A. $12.50.
B. $124.50.
C. $125.00.
D. $137.50.

Kelly has decided to start his own business giving sailing lessons. To purchase equipment for the business, Kelly withdrew $1,000 from his savings account, which was earning 3% interest, and borrowed an additional $2,000 from the bank at an interest rate of 7%. What is Kelly's annual opportunity cost of the financial capital that has been invested in the business?

A. $30
B. $140
C. $170
D. $300