15-(15*.8)
15-(12)
3
3 dollars
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80% of $25 is $20, so 80% off would be $5.
0.1 x 80 = 8
20% off of 14.99 dollars =80% left of 14.99 dollars =14.99*80/100 =11.992 dollars which should be rounded to 11.99 dollars.
"20 percent off" means "80 percent still on".80% of $2,000 = 0.8 x $2,000 = $1,600.00
You would pay $80.