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 4 days is $\rm 1.6 x 10^{8}$.

1. What was the number of bacteria before 4 days? 
2. How many days ago, the number of bacteria was $\rm 2.49984×10^{8}$.
3. How many bacteria decreased on the first day?