Rising price

The book first becomes more expensive by 5 euros. The new price was later increased by 28% after the second price increase book cost 30 euros.

What was the original price of the book?

Correct answer:

x =  18.44 Eur

Step-by-step explanation:

q=100%+28%=1+10028=1.28  (x+5) q=30 (x+5) 1.28=30  1.28x=23.6  x=1.2823.6=18.4375  x=16295=18.4375=18.44 Eur

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