First year 100x0.05 = 5 
Second year 100x0.05 = 5 
Third year 100x0.05 = 5 
Total interest 15$ for three year + the original amount mean 100 
Total after three year 
$115 
Because the interest not compounded mean : where previously accumulated interest is not added to the principal amount of the current period, so there is no compounding.