Average generation of sugar in years 1998, 1999, 2000, and 2001 = × (15 + 50 + 30 + 35) thousand metric tons .
= (32.5 × 1000) metric tons = 32500 metric tons
Normal generation of sugar in years 2001, 2002, 2003, 2004 = × (35 + 65 + 75 + 70) = (61.25 × 1000) metric tons = 61250 metric tons.