Ten workers will be stuffing envelopes with letters to prospective clients. each worker has to stuff, seal, address, and stamp 1,000 envelopes. however, there is no company letterhead available. the mailroom clerks make an order for letterhead to be delivered to the workers in order for each one to be able to finish their project. if each pack of letterhead brings 500 sheets, how many packs does the mail room need to order so that each worker can meet their goal?