Apineapple costs $5.04. together one banana and one pineapple cost the same as 13 bananas. what dose one banana cost? work.

5.04 + b = 13b                   b is cost of the banana 
-b               -b
5.04 = 12b
$0.42 = b

Part A: Change the percentage to decimal and multiply it by 460. So, 0.45 × 460 = 207
207 teenagers like comedy.

Part B: If 40 is 50% then double as that is 100% and 40×2=80
They surveyed 80 teenagers.

Part C: The currency exchange from euros to dollars went from $1.18 to $1.24 per euro. It had an increase of 105%