Table:
0
A
B
C
D
E
1
Total
Builder
Model
Year built
Numbers
2
1
GMDD
TC40-102N
1986
8790
3
2
MCI
TC40-102N
1988
8870, 8893
4
8
BIA
Orion 06.501
1998
9803-9810
5
5
NFI
D40LF
2003
0313-0317
6
6
NFI
D40LF
2005
0519, 0620-0624
7
2
Ford Eldorado
E-450 Aerotech
2006
0626, 0627
8
2
NFI
D40LF
2007
0728, 0729
9
1
Ford
E-450 Crestline body
2008
0830
10
1
International
LC
2008
0931
11
5
NFI
D40LF
2008
0832-0836
12
5
International
LC
2009
1037-1041
13
4
NFI
D40LF
2008
0942-0945
14
6
NFI
D40LFR
2010
1046-1051
15
1
General Motors/Chevrolet
4500 Arboc
2009
0952

Questions and formulas:
Question: How many entries feature a year built of 2010?
Formula: SUM(FILTER(A1, D1=2010))
Formula2: SUM(FILTER(A2:A15, D2:D15=2010))
Level: easy
Question: What are the numbers for lc models built in 2009?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="lc")*(D1=2009)),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,(C2:C15="lc")*(D2:D15=2009)),5))
Level: medium