Table:
0
A
B
C
D
E
1
Year
Theme
Artist
Mintage
Issue Price
2
2004
Santa Claus
N/A
60,965
19.95
3
2005
Christmas stocking
N/A
N/A
19.95
4
2006
Santa Claus and Rudolph the Red-Nosed Reindeer
N/A
N/A
19.95
5
2007
Christmas Tree
N/A
N/A
19.95
6
2008
Santa Claus
N/A
N/A
19.95
7
2009
Santa Claus
N/A
N/A
19.95

Questions and formulas:
Question: What was the mintage when the theme was Santa Claus?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="santa claus"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="santa claus"),4))
Level: medium
Question: What was the issue price in the year 2008?
Formula: SUM(FILTER(E1, A1=2008))
Formula2: SUM(FILTER(E2:E7, A2:A7=2008))
Level: easy