DB<13> $pa = 1.98

  DB<14> $pb = 1.98

  DB<15> p ($pb == $pb)
1
  DB<17> p ($pb - $pa)
0
  DB<18> 
  DB<22> $exp = sprintf("%.8f", $expected)

  DB<23> $pre = sprintf("%.8f", $premium)

  DB<24> p ($pre - $exp)
0