Контрольные задания > In the school of foreign languages, a discount applies to the first lesson. The price of the first lesson is 420 rubles instead of 700 rubles. What percentage of the lesson cost is the discount?
Вопрос:
In the school of foreign languages, a discount applies to the first lesson. The price of the first lesson is 420 rubles instead of 700 rubles. What percentage of the lesson cost is the discount?