Ineed a good grade on this test! 7. the cost for a business to make greeting cards can be divided into one-time costs and repeated costs. suppose the total cost to make 300 cards is $900.00, and the total cost to make 650 cards is $1,600.00. what is the total cost to make 1,000 cards? round your answer to the nearest dollar. a. $2,100.00 b. $2,300.00 c. $2,500.00 d. $3,000.00 9. the time between a lightning flash and the following thunderclap may be used to estimate, in kilometers, how far away a storm is. how far away is a storm if 6 seconds elapse between the lightning and the thunderclap? a. 18 kilometers b. 2 kilometers c. 3 kilometers d. 9 kilometers