The table shows the amount of protein in two types of fish and the cost of each. Based on the table, what is the ratio of the cost per gram of protein in salmon to the cost per gram of protein in tuna?
| Food | Protein | Cost |
|---|---|---|
| Salmon | 80 grams | $8.00 |
| Tuna | 75 grams | $4.50 |
3 : 5
5 : 3
2 : 1
10 : 6
