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Sum = ½ × number of numbers × (first number + last number) = ½ × (462 - 408 + 1) × (408 + 462) = ½ × 55 × 870 = 23,925
8*51 = 408
20% of 408= 20% * 408= 0.2 * 408= 81.6
If the sum of the original seven numbers is 2814, and they're all increased by 70, the new total will be 2814+490=3304
In today's terms: 814 is considered to be DCCCXIV in Roman numerals