maths
posted by wa .
Mandy can get 100kg of corn cob for $160 from Matt,on condition that she buys at least 100kg.From another supplier,she can buy 100kg or less for $1/cob,or more than 100kg for $0.60/cob.she gets $5/kg of con cobs or $1.25 for an individual con cob.if she sell over 100kg today.what is the best profit per cob she can make? The answer is $0.85,but I cannot work out,can someone please explain,thanks

Hmmm. you are mixing up price per kg and per cob, with no indication of how many cobs per kg.