I have been searching for an answer to this common exercise but could not find an example with regular monthly deposits contributed over the investment period:   Savings account:  $1000 contributed monthly for 5 years 1) Calculate savings after 5 years with interest=4% compounded annually (use DO loop) 2) Calculate savings after 5 years with interest=3.9% compounded monthly (use DO loop) 3) Calculate savings after 5 years with interest=3.8% compounded daily (use DO loop)   Here are the codes I have tried (the third one seems to return unrealistic value):   data compound_annually; principle=12000; rate=0.04; earned=0; do year=1 to 5; earned=principle+earned+(principle+earned)*rate; output; end; run; data compound_monthly; principle=1000; rate=0.039/12; earned=0; do month=1 to 60; earned=principle+earned+(principle+earned)*rate; output; end; run; data compound_daily; principle=32.87671233; rate=0.038/4380; earned=0; do day=1 to 21900; earned=principle+earned+(principle+earned)*rate; output; end; run;   Can someone please review the code and provide a better way to resolve the questions using do loops?   Thank you! ... View more