To solve this question, let's compare the account balances for each time.
x = 5
Bank A - f(5) = 70
Bank B - f(5) = 6.59
Bank A f(5) > Bank B f(5)
x = 10
Bank A - f(10) = 285
Bank B - f(10) = 56.67
Bank A f(10) > Bank B f(10)
x = 15
Bank A - f(15) = 650
Bank B - f(15) = 436.89
Bank A f(15) > Bank B f(15)
x = 20
Bank A - f(20) = 1165
Bank B - f(20) = 3324.26
Bank A f(20) < Bank B f(20)
If when x = 0, 5, 10, and 15 The account balance for Bank A was greater and when x = 20 the account balance for Bank B was greater, then Bank B’s account balance will exceed Bank A’s account balance between 15 and 20 years.
Answer: Bank B’s account balance will exceed Bank A’s account balance between 15 and 20 years.