Give the step-by-step reasoning process and then the final answer. John's grill messes up and burns half his steak. He eats 80% of what isn't burned. If the steak was originally 30 ounces how much steak did he eat?
There were 30 * .5 = 15 ounces of unburnt steak. So he ate 15 * .8 = 12 ounces of steak.
The final answer: 12.