Answer:
I believe for this particular equation you just want to use the equation for simple interest: I = P * r * t
Explantion:
I = Interest
P = principal
r = rate
t = time
change the rate: 1.5% into a decimal: 1.5/100 = .015 and plug in the values
I = 20,000 * (.015*10)
I = 20,000 * .15
I = 3000
add the interest to the principal to get the value after 10 years
20,000 + 3000 = 23,000
giving you $23,000 after 10 years.