Percentages: The most useful statistics ever invented

The percentage of males is 12 “out of” 20, or 60%. The percentage of females is 8 “out of” 20, or 40%. (20 is the base.) To how many decimal places should a percentage be reported? ... Going back to the army recruits, suppose that before you carried out the survey you had a hunch that about 23% of the recruits would be Catholic. ... ................
................