Question: Interview cost Day Evening Children $ 2 0 $ 2 5 No children $ 1 8 $ 2 0 [ Note: X 1 = no

Interview cost
Day
Evening
Children
$20
$25
No children
$18
$20
[Note: X1= no. of daytime interviews of households with children. x2= no. of evening interviews of households with children. x3= no. of daytime interviews of households without children. x4= no. of evening interviews of households without children.]
Which of the following constraints is correct?
x1+x2+x3+x42000
x1+x2+x3+x4=2000
 Interview cost Day Evening Children $20 $25 No children $18 $20

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