Ten > Growth and Depreciation

Asked by Basanta · 2 years ago

Due to the use of medicines, the number of bacteria is decreasing at the rate of 20% per day so the number of bacteria after 3 days is $\rm 2.5 × 10^8$,

1. What was the number of bacteria before 3 days?
2. How many days ago, the number of bacteria was $\rm 3.1232 × 10^8$?
3. How many bacteria decreased on the first day?