In order to get a square base that has 100 boxes, each side must have 10 boxes.
So, 10 boxes times 10 boxes gives you 100 boxes on the base.
Then, the next level would only have 9 boxes on each side, giving you a second level with 81 boxes.
The following would be 8 x 8
then 7 x 7
then 6 x 6
All the way to the top which is only one box.
So add 102+92+82+72+62+52+42+32+22+12
or 100+81+64+49+36+25+16+9+4+1
Which equals 385 boxes.
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The digit 6 has no meaning in base 4.
To subtract 11 in base 2 from 100 in base 2, you first convert both numbers to decimal. 100 in base 2 is equal to 4 in decimal (12^2 + 02^1 + 02^0). Similarly, 11 in base 2 is equal to 3 in decimal (12^1 + 12^0). Subtracting 3 from 4 in decimal gives you 1 in decimal, which is equal to 1 in binary (12^0). Therefore, 100 in base 2 minus 11 in base 2 equals 1 in base 2.
Here is a trick for figuring out perctages. Put your figures like this: mulitply 18 x 100 = 1800 then divide that by 5 then you will have the number of boxes the troop sold. 56 (I did that in my head so check on the calculator)
There are infinitely many ways to get to 100.
log 8.008