On May 1, Cleveland Livingston opened a savings account that paid 3.5% interest at Fulton Savings Bank with a deposit of $5,000. Ten days later, he deposited $2,000. Fourteen days later, he deposited...

On May 1, Cleveland Livingston opened a savings account that
paid 3.5% interest at Fulton Savings Bank with a deposit of $5,000.
Ten days later, he deposited $2,000. Fourteen days later, he deposited
$8,000. No other deposits or withdrawals were made. Six days later,
the bank calculated the daily interest.
a. How much simple interest did his money earn?