Final answer:
The true percent discount on each box of granola bars with the 'buy 2, get 1 free' deal is approximately 33.3%.
Step-by-step explanation:
To determine the true percent of discount on the box of granola bars, let's first calculate the total cost without the discount. Buying three boxes at the regular price of $4.00 each would cost 3 × $4.00 = $12.00. With the 'buy 2, get 1 free' deal, you pay for 2 boxes and get the third box for free, so the total cost is 2 × $4.00 = $8.00.
Next, we calculate the savings by subtracting the total cost with the deal from the total cost without the deal: $12.00 - $8.00 = $4.00.
To find the percent discount, we divide the savings by the total original cost and multiply by 100: ($4.00 / $12.00) × 100 = 33.3%.
Therefore, the percent discount on each box of granola bars, when you use the 'buy 2, get 1 free' offer, is approximately 33.3%, to the nearest tenth of a percent.