Mark works at a bike store. He makes $30 per day. For every bike that he sells, he will make $20.
a. What is the unknown? Identify it and create a variable.
b. Is there a constant (an amount that never changes)? What is it?
c. Write an expression for how much Mark can make in one day. (Note: this is the general term)
d. Last Saturday, Mark sold 5 bikes. How much money did he make that day?
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