An airline company is interested in the opinions of their frequent flyer customers about their proposed new routes. specifically, they want to know what proportion of them plan to use one of their new hubs in the next 10 months. of their customers, 45% are silver-level, 30% are blue, and 25% are red. they first compile separate lists of silver, blue, and red members and then randomly select 4500 silver members, 3000 blue members, and 2500 red members to e-mail. they take that sample of 10,000 and send them an e-mail message with a request to fill out a survey in exchange for 2000 miles. what kind of sampling method have they used?

He moto hotel opened for business on may 1, 2017. here is its trial balance before adjustment on may 31. moto hotel trial balance may 31, 2017 debit credit cash $ 2,283 supplies 2,600 prepaid insurance 1,800 land 14,783 buildings 72,400 equipment 16,800 accounts payable $ 4,483 unearned rent revenue 3,300 mortgage payable 38,400 common stock 59,783 rent revenue 9,000 salaries and wages expense 3,000 utilities expense 800 advertising expense 500 $114,966 $114,966 other data: 1. insurance expires at the rate of $360 per month. 2. a count of supplies shows $1,050 of unused supplies on may 31. 3. (a) annual depreciation is $2,760 on the building. (b) annual depreciation is $2,160 on equipment. 4. the mortgage interest rate is 5%. (the mortgage was taken out on may 1.) 5. unearned rent of $2,580 has been earned. 6. salaries of $810 are accrued and unpaid at may 31