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.

Question 2Change answer

a)  How much would 4 cans cost?  

Question 2Change answer

b)  How much would 10 cans cost? 

Question 2Change answer

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

Question 2Change answer

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