(1) His income in the first half of the year 2002 was 1500*6 = 9000 dollars. (2) His income in the second half of the year 2002 was 9000*0.75 = 6750 dollars. (3) His total income in the year 2002 was 9000 + 6750 = 15750 dollars. (4) Let X be his total income in the year 2001. Then 1.2X = 15750; hence, X == 13125 dollars. (5) Now his average monthly income in the year 2001 was = 1093.75 dollars. ANSWER