What was the percentage increase in total sales in 2003 from 1998 (rounded off to nearest integer)?
20
Total sales in 1998
= (25 + 45 + 38 + 52 + 47 + 55) million tons
= 262 million tons
Total sales in 2003
= (43 + 55 + 49 + 63 + 42 + 62) million tons
= 314 million tons
∴ % increase = 314−262262×100
= 19.85 ≈ 20%