I would take 50% of each of the prices because it is mixed equally. So, half of $8.50 is $4.25 and half of $6 is $3. add $4.25 and $3 to get $7.25 for the price of one pound of mix.
I THINK IT'S
0+50*1-60-60*0+10= 0
75,069 divided by 45 is 1,668.2
I showed my division work here : http://i.imgur.com/v79bHDA.jpg
by bargaining with the owner, vying for discounts or insisting on multiple products for a complimentary value deal