The label explicitly states not to exceed 4 tablets in 24 hours.
The sign specifies "Buy one, get one 50% off," meaning the first item is full price, and the second is discounted.
The total bill is $125.00, so paying $75.00 leaves a balance of $50.00.
The ad specifies "basic computer skills" as a requirement. The other options are not mentioned.
Ingredients are listed in order of quantity, with the main ingredient listed first. In this case, it's corn.