If $$7,000$ is invested in an account for $30$ years. Calculate the total interest earned at the end of $30$ years if the interest is:

$($a$)6\%$ simple interest: $

$($b$)6\%$ compounded annually: $

$($c$)6\%$ compounded quarterly: $

$($d$)6\%$ compounded monthly: $

Round your answers to the nearest cent.

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