Hi,
Callie paid $5.16 in all for the gallons of juice. If she sold the juice .75 for 1/16 gallon each she made $12.00 in all. So Callie made $7.84 more than what she paid for the juice. I got my answer by multiplying 75 by 16 and I got $12.00 and from there I just subtracted $5.16 away from $12.00.
I hope I helped have a great day/night!!!