Hannah made a deposit into her savings account at a simple annual interest rate of 5%. Hannah earned $3600 in interest after 8 years. What amount did Hannah originally deposit? A. $4500
B. $7200
C. $9000
D. $12,600
ps its NOT B

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min