0
Anonymous
10 + 10 + 20 + 20 +20 = 80.
Wiki User
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30
80
10+10
well if you add together 2 and 2, it makes 4 so ,10 add 10 is 20 ,so double 20, is obviously 40.
1000 + 1000 + 1000 + 1000 + 40 + 30 + 20 + 10 = 4100
50
Add by 10 each time.