The equation we will use is I=PRT
I is the interest, P is the principal, or deposited amount, R is the rate as a decimal, not percentage, and T is time in years.
Convert 0.4% to a decimal by dividing by 100 = 0.004
Convert 12 months into years = 1
I = (18,000)(0.004)(1)
I = 72
$72 interest earned.
LMK if you have questions