Final answer:
The constant of proportionality for this situation is 1.2.
Step-by-step explanation:
The number of packages per dollar can be represented by the equation p = A x n, where p is the number of packages, A is the constant of proportionality, and n is the amount of money spent. In this case, it cost $5 to send 6 packages, so we can set up the equation 6 = A x 5. To find the constant of proportionality, we can solve for A:
A = 6/5 = 1.2
Therefore, the constant of proportionality for this situation is 1.2.