To figure this out, you need to find out what 80% of the cost would be, and add it to the original price.
To find out 80% of 1.25, you need to convert 80(%) to a decimal. You can do this by dividing 80 by 100.
80/100 = 0.8
Add this to the original cost.
1.25 + 0.8 = 2.05
Your total cost in the end would be $2.05