Table:
0
A
B
C
D
E
1
Date
Title
Peak position
Weeks
Sales
2
December 13, 2000
" M "
1
18 weeks
1,319,070
3
January 31, 2001
" Evolution "
1
17 weeks
955,250
4
March 7, 2001
" Never Ever "
1
12 weeks
756,980
5
May 16, 2001
" Endless Sorrow "
1
11 weeks
768,510
6
July 11, 2001
" Unite! "
1
17 weeks
571,110
7
September 27, 2001
" Dearest "
1
16 weeks
750,420
8
December 12, 2001
" A Song Is Born "
1
10 weeks
441,410
9
March 6, 2002
" Daybreak (re-cut single)"
2
9 weeks
197,140

Questions and formulas:
Question: What was the Peak Position on July 11, 2001?
Formula: SUMIFS(C1,A1,"july 11, 2001")
Formula2: SUMIFS(C2:C9,A2:A9,"july 11, 2001")
Level: easy
Question: On December 12, 2001, how many weeks had the single been in its position?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="december 12, 2001"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="december 12, 2001"),4))
Level: medium