[ Percentage and ratio problems ]

During the year, the prices of strudels were raised twice by $50 \%$, and before New Year's, they started selling them at half price.

How much does one strudel cost now if it cost 80 rubles at the beginning of the year?

#
After the first price increase, the strudel cost $80 \cdot 1.5 = 120$ rubles; after the second price increase $120 \cdot 1.5 = 180$ rubles; finally, after a two-fold price reduction, it cost $180 : 2 = 90$ rubles.

## Answer

90 rubles.