This question is incomplete. Below is the complete question:
A bank account earned 3.5% continuously compounded annual interest. After the initial deposit, no deposits or withdrawals were made. At the end of an 8 year period, the balance in the account was $13231.30. what is the amount of the initial deposit?
Answer: The initial deposit is $10,001
Step-by-step explanation:
 To solve this we need to utilize the continuous compounding interest formula:-
 Fv = Pv × e^(i × t)
 Where, Fv = the future value
 Pv = present value
 i = the interest rate
 t = the time in years
 e = a mathematical constant that is usually approximated by 2.7183
 In this case, the Fv = 13,231.30
 i = 3.5% or 0.035
 t = 8 years
 e = 2.7183
 Pv = ? (The unknown variable).
 13,231.30 = Pv × [2.7183^(0.035 × 8)]
 13,231.30 = Pv × [2.7183^(0.28)]
 13,231.30 = Pv × 1.323
 Pv = 13,231.30/1.323
 Pv = $10000.98
 = $10,001
 Therefore the initial deposit is $10,001