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print 0.29 * 50;;
14.5

printf "%.20f\n", 0.29 * 50;;
14.49999999999999800000

printf "%.20f\n",  eval eval( 0.29 ) * eval( 50 );;
14.50000000000000000000

printf "%.20f\n",  eval 0.29 * 50;;
14.50000000000000000000

$n = 0.29 * 50; printf "%.20f\n",  "$n";;
14.50000000000000000000