Answer:
Happy Birthday by the way! After 10 years its bank A, After 20 years its Bank B
Explanation:
IA(1+r)^t
After 10 years
600(1.05)^10 = 977.34
500(1.06)^10 = 895.42
After 20 years
600(1.05)^20 = 1591.98
500(1.06)^20 = 1603.57
-- Gage Millar, Algebra 1/2 tutor