Escape the extreme Pet Shop?

What is the cost of 1 armadillo

2a+7=29

What is the cost of one hyena?

1+3h=13

What is the cost of one shark?

3s-20=34

What is the cost of one elephant?

4e+15=43

What is the cost of one tiger?

6t+2=20

What is the cost of one snake?4s+12=36

What is the cost on one iguana?

2i+16=20

What is the cost of one piranha?

2p+4=34