A cup of kopi-O that cost S$0.20 to $0.40 in 1985
A cup of kopi-O that cost S$1.00 in 2020 now it averages S$1.40 (a 40% increase)
Comparing two time periods, we see a notable increase in growth over the years. Specifically, the rate of change from 1985 to 2020 was 70% over a span of 40 years, while the growth from 2020 to 2025 was 40% over just 5 years.