Brad wants to open a new savings account. he finds one that returns 3% on his investment each year assign a variable to each of the following pieces of information

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams