Final answer:
After calculating Mikel's original tip percentage as 253.125%, both the $2.22 tip for a $14.80 order and the $1.86 tip for a $10.50 order were found to be not proportional, with their tip percentages at 15% and 17.71% respectively.
Step-by-step explanation:
To determine if a tip is proportional, we need to compare the ratio of the tip to the cost of the order. Mikel originally gave an $8.80 order with a 81:32 tip ratio. To determine if the other tips are proportional, we need to compare them to Mikel's ratio.
Firstly, let's calculate Mikel's tip percentage by dividing 81 by 32, which gives us approximately 2.53125. To find the percentage, we multiply by 100, resulting in a 253.125% tip. Now, we have to see if the other tips match this percentage.
For the $2.22 tip on a $14.80 order:
$2.22 / $14.80 × 100% = 15%, which is not proportional to Mikel's tip.
For the $1.86 tip on a $10.50 order:
$1.86 / $10.50 × 100% = 17.71%, which is also not proportional to Mikel's tip.
Therefore, both given tip scenarios are Not proportional to Mikel's tip.