2.79 is a mixed number in decimal form and there is no sensible way to represent it as a whole number. The whole part of it is 2.
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280
The previous whole number or integer to 280 is 279
279 is a composite number. Its positive integer factors are: 1, 3, 9, 31, 93, 279
Both the number 279 and 24 "go into" 2,232. 279 goes in 8 times and 24 goes in 93 times.
20% means 20/100 = 1/5 So 20% of $279 is 1/5 x $279 = $55.80 So 20% off $279 is $279 - $55.80 = $223.20 Alternatively, note that 1/5 off a whole is 1 - 1/5 = 4/5, so $279 x 4/5 = $223.20