It is -610.
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percent notation for 7.1 = 710% 7.1 * 100% = 710%
It is: (710-645)/645 times 100 = 10.076% rounded to 3 decimal places
D = 500 C = 100 (so CC = 200) X = 10 DCCX = 710
71/10
710 out of 90, as a percentage = 100*70/90 = 77.777...