The formula for total loan cost is attached.
10 years = 120 payments
MONTHLY Interest = .0325 / 12 =    0.0027083333    
total = 0.0027083333 * 21,000 * 120 / (1-(1.0027083333)-120   
total = 6,825 / (1-    0.7228448406    )
total = 6,825 /    0.2771551594    
total =    24,625.20