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Sad Look Of Martin

Here is Martin, a good friend of mine, he is a bit down now. Recently he broke up with one girl and he also got some other things to worry about. All together, as he told me, add up in that sad look.

"Was nice to see you and Sebastian for a coffee tonight. Cheer up man, the things will get better soon."



There are twenty rows of seats in an auditorium. If te first row has 20 seats and each seccessive row has 6 more seats than the previous row, how many seats are in the auditorium?

A) 1,600
B) 1,540
C) 1,440
D) 1,200
E) 1,040


Please add an explanation or understanding to your answer. It will help me to understand the problem better. Thanks.