print sprintf( "%.30f",     66.5 * ( ( 100 + 19 ) / 100 ) ), "\n79.135000";
print sprintf( "%.2f",   66.5 * ( ( 100 + 19 ) / 100 ) ), " <-- wrong, expected 79.14\n";
;
print sprintf( "%.30f",     66.5 * (   100 + 19 ) / 100   ), "\n79.135000";
print sprintf( "%.2f",   66.5 * (   100 + 19 ) / 100   ), " <-- ok = 79.14\n";