there are 16oz in 1lb, how many ounces are there in 5lbs?
well, is just 16 added 5 times or 80oz
so, you're buying 80oz of meat for $12.40
how much is the cost of each ounce of meat? 12.40/80 or 0.155
about 15 cents and a half.
and you use 8oz a day, how much is 8oz? well, just 0.155 added 8 times, or 0.155 * 8, which is 1.24, a buck and 24cents.