Metode Laspeyres
IL=∑(P2×Q1)/(P1×Q1)×100%
P2×Q1
12X100=1200
43x80=3440
14x50=700
16x70=1220
27x60=1620
20x40=800
1200+3440+700+1220+1620+800=8980
P1xQ1
10x100=1000
42x80=3360
12x50=600
14x70=980
25x60=1500
17x40=680
1000+3360+600+980+1500+680=8120
8980/8120x100%=110,49(E)
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Metode Laspeyres
IL=∑(P2×Q1)/(P1×Q1)×100%
P2×Q1
12X100=1200
43x80=3440
14x50=700
16x70=1220
27x60=1620
20x40=800
1200+3440+700+1220+1620+800=8980
P1xQ1
10x100=1000
42x80=3360
12x50=600
14x70=980
25x60=1500
17x40=680
1000+3360+600+980+1500+680=8120
8980/8120x100%=110,49(E)