Question

Jed deposited $400 into a bank that offers 3.9% interest rate compounded daily and how many years will his balance be $800 ​

Answer 1

18 years ( approx )

Explanation:

Since, if an amount is compounded daily,

Then, the final amount after t years is,

A= P(1 + r/365) 365t

Where, P is the principal amount

r is the annual rate ( in decimals ),

t is the number of years,

Given,

A = $ 800,

r = 3.9% = 0.039,

P = $ 400,

By substituting the values,

800= 400 (1 + 0.039/365)365t

t = 17.774 = 18

Hence, his balance will be $800 after approximately 18 years.