91.8
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It has increased by 9, 9 is 10% of 90 so it has increased by 10%. 99 is therefore 110% of 90. Formula: (99 - 90) / 90 = 0.1, or 10%
To do this multiply 90 by 104%, or 1.04: 90x(1.04)=93.6
.2 * 90 = 18
91.8
2 * 1.1 = 2.2