Table:
0
A
B
C
D
E
1
Year
Theme
Artist
Mintage
Issue Price
2
2005
Fur Traders
John Mardon
4,500
$489.95
3
2006
Timber Trade
John Mardon
4,500
$489.95
4
2007
Fishing Trade
John Mardon
4,000
$579.95
5
2008
Agricultural Commerce
John Mardon
4,000
$619.95
6
2009
Coal Mining Trade
John Mardon
4,000
$697.95
7
2010
Petroleum and Oil Trade
John Mardon
4,000
$999.95

Questions and formulas:
Question: What theme had an issue price of $489.95 after 2005?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="$489.95")*(A1>2005)),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(E2:E7="$489.95")*(A2:A7>2005)),2))
Level: medium
Question: What year was the timber trade?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="timber trade"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="timber trade"),1))
Level: medium
Question: What year has an issue price of $697.95?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="$697.95"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="$697.95"),1))
Level: medium