Answer:
The monthly deposit is calculated using PMT function :
rate = 1.2%/2 (converting annual rate into monthly rate)
nper = 12 * 5 (5 years of deposits with 12 monthly deposits each year)
pv = -3200 (Amount put into account now. This is entered with a negative sign because it is a cash outflow)
fv = 26865 (Required value of account after 5 years)
PMT is calculated to be $379.70.
The monthly deposit is $379.70.