Answer:
3.08$
Explanation:
Lets solve this problem using an algebraic equation.
In this case, I am using the variable "x" as the second package of coffee.
First: x+0.3
Second: x
Third: x+0.66
Setting up the equation. All packages of coffee add up to $10.20.
x+x+0.3+x+0.66 = 10.20
Combine like terms.
3x + 0.96 = 10.20
Subtract 0.96 on both sides.
3x = 9.24
Divide 3 on both sides.
x=3.08