Erica's earlier rent was = 1125 per month
Moving to Manhattan, rent goes up by 100 %.
Means the extra amount of rent will be = 1125 * 100 %
= 1125 * 100/100 = 1125
So new rent = 1125 (earlier) + 1125 (extra) = 2250 : Answer
Hope it will help :)
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