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Vara A kostar 20kr per einingu og vara B kostar 10kr per einingu. Tekjur neytandans eru 100kr. hva af eftirfarandi vrukrfum er ekki tekjubandi neytandans?
Vara A kostar 20kr per einingu og vara B kostar 10kr per einingu. Tekjur neytandans eru 100kr. hva af eftirfarandi vrukrfum er ekki tekjubandi neytandans?
a. A=40 og B=20
b. A=20 og B=40
c. A=2,5 og B=95
d. A=5 og B=90
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