Multiplies by 3, then subtracts 7
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Seven is added each time. 6 + 7 = 13 13 + 7 = 20 And so on...
One possible rule is: Un = (243n5 - 4210n4 + 27225n3 - 60830n2 + 106452n - 45960)/120 for n = 1, 2, 3, etc
20% off of 27:= 20% discount applied to 27= 27 - (20% x 27)= 27 - (0.20 x 27)= 27 - 5.4= 21.6
34, 41
20% of 27= 20% * 27= 0.2 * 27= 5.4