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  DB<28> $x1 = (1.15*170)+0.50;

...
  DB<30> printf("%.20f",0.15)
0.14999999999999999000
  DB<31>

  DB<35> $x1 = (115*170)+50; # no fractions

...
  DB<37> p "$x1 = ",int $x1
196 = 196
  DB<38>