Initial price = $0.88 (Jan. 1980)
Final price = $2.11 (Jan. 2015)
Change in price = $2.11 - $0.88 = $1.23
Percentage rise in price = 100(1.23/0.88) = 139.8% ≈ 140%
The average yearly rise in price = 139.8/(2015-1980) ≈ 4%
Answer:
Total percent rise in price = 140%
Average yearly rise in price = 4%
