Use the following to answer questions:
Figure: The Demand for Shirts 
-(Figure: The Demand for Shirts) Look at the figure The Demand for Shirts. At a price of $30, total revenue is _____, and at a price of $10, total revenue is _____.
Definitions:
Piaget's Theory
A theory of cognitive development that outlines how children's abilities to think and reason progress through several stages from infancy to adolescence.
Cognitive Development
The development and transformation in cognitive skills, which include the ability to think, reason, and comprehend.
Maturation
The unfolding of genetically determined traits, structures, and functions.
Deferred Imitation
The ability observed in some individuals, especially children, to reproduce a behavior observed at an earlier time without immediate imitation.
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Q220: If the demand curve for clams is
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Q243: If the income elasticity of demand for