If the 1 80 is meant to be 1/80
then half is 1/80 x 1/2 = 1/160
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note: one quarter = 1/4 one half of one quarter of one tenth of 80:= 1/2 of 1/4 of 1/10 of 80= 1/2 x 1/4 x 1/10 x 80/1= 80/80= 1
There are 80 positive integers from 1 to 80.Half of them are even, the other half are odd.So there are 40 even integers from 1 to 80.2, 4, 6, and 8 have only 1 digit.All the rest have 2 digits.So the answer is (40 - 4) = 36 .However, as the question asked "less than 80" we can not include 80 and so the answer is 35.
1 percent of 80 = 0.801% of 80= 1% * 80= 0.01 * 80= 0.80
It is 80/1.
80% of 1000 = 1000*80/100 = 80080 percent of 1000 = 800