Answer: -7
Step-by-step explanation:
1)

3)

notice the rate "r"... now, is in decimal format, as you saw on 1) is just r/100 so 1.6% was really 1.6/100 or 0.016 anyhow
to get the percentage form, just multiply it by 100
The answer is 12. 16 divided by 4 is 4. 4 x3 is 12