Answer:
Interest save in 1 full month=$7.74
Explanation:
In this question we have given
credit card balance,P = $2,856.74
rate,R=14.75%
monthly installment,n=$629.63
Therefore, Interest save in 1 full month=
.............(1)
put values of n and R in equation (1)

Interest save in 1 full month=$7.74