1, 2, 5, 10.
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20
2 with 20 remaining 80 - 20 = 60 = 30 x 2
2 goes into 4. 3 goes into 6 or 9. 5 goes into 10, 15, 20, 25, 30. 7 goes into 14, 21, 28.
10, 20, 30, 40, .....100, 110, ... the list goes on forever!
20% off of 30 = 24= 20% discount applied to 30= 30 - (20% * 30)= 30 - (0.20 * 30)= 30 - 6= 24