Question 934290
This is a mixture problem in which you know the quantity of one of the ingredients but not the other ingredient.


The price for craisins,  {{{6.80/8}}}.
The price for chocolate chips, {{{6.80/8+(0.30)6.8/8=1.105}}}.


Let c be the quantity of chocolate chips; the percent in the mixture can be computed later.


Account for price.
{{{highlight((6.8+1.105*c)/(8+c)=0.99)}}}.
The numerator is the COST of the mixture and the denominator is the POUNDS of the mixture; and c is how many POUNDS of chocolate chips.  Now you can find the percentage.