If the total revenue function for a toy is 
dollars and the total cost function is 
dollars. What is the instantaneous rate of change of profit if 10 units are produced and sold? Explain its meaning.
?
A. 0.20. Selling an additional unit when 10 have been sold increases profit by $0.20.
B. 0.60. Selling an additional unit when 10 have been sold increases profit by $0.60.
C. 6.80. Selling an additional unit when 10 have been sold increases profit by $6.80.
D. 7.00. Selling an additional unit when 10 have been sold increases profit by $7.00.
E. 234.00. Selling an additional unit when 10 have been sold increases profit by $234.00.
Answer: A
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