Q: The salaries of T in twelve months of a year are: `12,000, `12,000, `12,000, `15,000, `15,000, `15,000, `21,000, `21,000, `21,000, `30,000, `30,000, `30,000. The average salary of T per month in ` is _______. एक वर्ष के बारह माह में T का वेतन इस प्रकार है : `12,000, `12,000, `12,000, `15,000, `15,000, `15,000, `21,000, `21,000, `21,000, `30,000, `30,000, `30,000, T का प्रति माह औसत वेतन ` में कितना है?