The answers to the application questions based on page 18 of the first volume of the fifth grade mathematics textbook published by People's Education Edition are as follows:

This question asks how much a * * * needs to pay, that is, it should be the sum of the price of printing 30 additional photos and the money for taking a group photo.

(1) First find out the total price of 30 attached photos: unit price x quantity = total price.

2.5x30 = 75 (yuan)

(2) Add the total price of 30 additional photos to the cost of taking photos, and you can figure out how much a photo costs.

75+27.5 = 102.5 (yuan)

Answer: (omitted)