Using the same logic, can you tell how much a mango costs?

Question

At my favorite fruit stand,
an orange costs 18¢,
a pineapple costs 27¢,
and a grape costs 15¢.

Using the same logic, can you tell how much a mango costs?

Answer 1

Answer is 15
As word "orange" consist 6 letters ,so answer is 6*3=18
"pineapple" consist 9 letters, so 9*3=27
"grape" consist 5 letters so 5*3=15
Now
Mango consist 5 letters so 5*3=15

Answer 2

Logic is number of letters in the fruit's name multiplied by 3
Cost of mango = 5*3=15