$1000 is left in a bank account for 5 years.

If it receives 4% a year compounded annually, how much will be in the acount at the end of 5 years?

At the end of 10 years, there is $4,036.66 in a bank account. If the account received a nominal annual interest rate of 6% a year compounded semi-annually, how much was originally put in the bank?