2. Genghis Khan organized his men into groups of 10 soldiers under a "leader of 10". Ten "leaders of 10" were under a "leader of 100". Ten "leaders of 1000" were under a "leader of 1,000."
(a) If Khan had an army of 10,000 soldiers at the lowest level, how many men in total were under him in his organization?
(b) If Khan had an army of 5,763 soldiers at the lowest level, how many men in total were under him in his organization? Assume that the groups of 10 should contain 10 if possible, but that one group at each level may need to contain fewer.

7. You have a digital music collection of 2,300 songs with an average of 4.6 MB storage required for each song.
(a) How many 650 MB CDs will it take for you to burn your entire collection?
(b) If you could burn it to 4.7 GB DVDs, how many DVDs would it take?

8. You have a digital photo collection with photos that require an average of 75 KB of storage each.
(a) How many photos can you fit on a 650 MB CD?
(b) How many photos can you fit on a 4.7 GB DVD?

11. A desktop laser printer has a 300-pixel per-inch resolution. If each pixel is stored in one bit of memory, how many bytes of memory are required to store the complete image of one 8 1/2- by-11 inch page of paper?

2a. 11,110 soldiers
Khan - leader of 10,000
Leader of 1,000
Leader  of 100
Leader of 10
add all=11,000
2b. 6,401 soldiers
5,763+576+57+5 (divide each "leader" by ten)
7. 16.28 CDs, 2.25 DVDs
2,300 songs times 4.6 MB = 10,580 MB = 10.6 GB
10,580 / 650 = 16.28 CDs
10.6 GB / 4.7 GB = 2.25 DVDs
8.  8875 pictures on CD, 65,711 pictures on DVD
650 MB = 665,600 KB
4.7 GB = 4,928,307.2 KB
665,600 KB / 75 = 8874.67
4,928,307.2 / 75 = 65,710.76
11. 3,506.25 bytes
300 b = 37.5 B *8 + (37.5/2) = 318.75 B * 11 = 3,506.25 B