50% of the inhabitants of the alien planet 'Fisto' own heaters and personal computing devices. What percentage of the inhabitants of the planet own personal computing devices, but not heaters? (1) 60% of the inhabitants own personal computing devices. (2) 70% of the inhabitants own heaters.   Statement (1) ALONE is sufficient, but statement (2) ALONE is not sufficient.   Statement (2) ALONE is sufficient, but statement (1) ALONE is not sufficient.   BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.   EACH statement ALONE is sufficient.   Statements (1) and (2) TOGETHER are NOT sufficient.   Hint Half-n-half Clue