Dude Solutions employs four workers. Judy is capable of knitting 20 scarfs or 5 sweaters. Carlos can knit 8 scarfs or 8 sweaters. Mary can knit 4 scarfs or 16 sweaters. Bob can knit 40 scarfs or 20 sweaters.
B)judy OP of producing one sweater=20/5=4
Carlos OP of producing one sweater =8/8=1
Mary OP of producing one sweater=4/16=1/4=0.25
Boby OP of producing one sweater=40/20=2
The lower OP person will produce sweater first than the high OP person .
So mary has lowest OP ,so he will produce 16 sweater. So OP of 16 sweater =16*0.5=8
Carlos have next lowest OP ,so he will produce 4 sweater and OP =4*1=4
Producing first year 20 sweater =8+4=12
C)judy OP of producing one scarf=5/20=0.25
Carlos OP of producing one scarf=8/8=1
Mary OP of producing one scarf=16/4=4
Bob OP of producing one scarf=20/40=0.5
First 20 scarf produced by judy at OP =0.25*20=5
Next 17 scarf produced by bob bob at OP=17*0.5=8.5
OP of 37 producing 37 scarf=5+8.5=13.5
D)60 scarf means 20 of judy + 40 of bob. But dude solution can produce at same time 24 sweater (16 of mary and 8 of carlos). It means carlos is currently doing nothing.
So expanding scarf production by 8 units have zero opportunity cost as carlos will produce next 8 units of scarfs .it dude solution is currently under ppf curve.