The length of a rectangle is increased by $50\textbackslash\%$ and the width is decreased by $20\textbackslash\%$. What percent of the old area is the new area? (adapted from 2009 AMC 8, Question \#8) 
选项为:A:$$90$$  B:$$95$$  C:$$100$$  D:$$110$$  E:$$120$$  请回答其中一个选项.