To do this I did a ratio of 12:8 for the chocolate and then a ratio of 0.75:? for the rasins
To get from 12 to 0.75 we divide by 16 so we do the same for the 8 so 8/16 is 0.5 which is equal to 1/2 therefore for 8oz of chocolate you need 1/2 cup of rasins