Cans of fruit drink

This task is about working out costs.
stack-of-cans.png

Use the diagram of the stack of cans to help answer the following questions.

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a)  How much would 4 cans cost?  

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b)  How much would 10 cans cost? 

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c) What is the largest number of these cans that could be bought for $5?

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d)  If 15 cans were bought, what would be left over from $20?  
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