John makes deposits of $P at the end of each year for the first n years,...

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John makes deposits of $P at the end of each year for the first n years, $2P at the end of each year for the next n years, and so on, and finally $mP at the end of cach year for the last n years. Find the accumulated amount just after the last deposit and express the answer in terms of P, i, m, an, and sm. John makes deposits of $P at the end of each year for the first n years, $2P at the end of each year for the next n years, and so on, and finally $mP at the end of cach year for the last n years. Find the accumulated amount just after the last deposit and express the answer in terms of P, i, m, an, and sm.