In the given expression $32+80\times 4-7=345$, if the symbols '+' and '$\times$ ' are interchanged, then what will be the new value of the expression ?

The original expression is: $32+80\times 4-7$
Interchanging '+' and '$\times$ ' gives the revised mathematical expression:

$$32\times 80+4-7$$

Applying the BODMAS rule:

1. Multiplication:

$$32\times 80=2560$$

2. Addition:

$$2560+4=2564$$

3. Subtraction:

$$2564-7=2557$$

The new value of the expression is $2557$.