选择题
2015 AMC 8 Problem 9: Odd Widgets Sum
On her first day of work, Janabel sold 1 widget. On day two, she sold 3 widgets. On day three, she sold 5 widgets, and on each succeeding day, she sold two more widgets than on the previous day. How many widgets in total had Janabel sold after working 20 days?
2015 AMC 8 第9题：奇数小部件总和
贾纳贝尔上班第一天就卖掉了 1 个小部件。第二天，她卖掉了 3 个小部件。第三天，她卖出了 5 个小部件，接下来的每一天，她都比前一天多卖出两个小部件。 Janabel 工作 20 天后总共售出了多少件小部件
A.
39
B.
40
C.
210
D.
400
E.
401