Question

Стоимость одной минуты междугороднего телефонного разговора составляет 20 рублей.После 5 минут разговора предоставляется скидка 5%.Сколько рублей будет стоить разговор продолжительностью 20 минут?

Answer 1

20*5=100 стоимость первых 5 минут
20*0.05=1
20-1=19 стоимость со скидкой 5%
19*15=285 стоимость за оставшихся 15 мин.
285+100= 385 стоимость всего разговора

Answer 2

Calculation of the Cost of a 20-Minute Long-Distance Phone Call

To calculate the cost of a 20-minute long-distance phone call, we need to consider the following information:

- The cost of one minute of a long-distance phone call is 20 rubles. - After 5 minutes of conversation, a 5% discount is provided.

Let's break down the calculation step by step:

1. Calculate the cost of the first 5 minutes: - The cost of one minute is 20 rubles. - Multiply the cost per minute by the number of minutes: 20 rubles/minute * 5 minutes = 100 rubles.

2. Calculate the cost of the remaining 15 minutes: - The cost of one minute is 20 rubles. - Multiply the cost per minute by the number of minutes: 20 rubles/minute * 15 minutes = 300 rubles.

3. Apply the 5% discount to the cost of the remaining 15 minutes: - Calculate the discount: 5% of 300 rubles = 0.05 * 300 rubles = 15 rubles. - Subtract the discount from the cost of the remaining 15 minutes: 300 rubles - 15 rubles = 285 rubles.

4. Add the cost of the first 5 minutes and the discounted cost of the remaining 15 minutes: - Total cost = 100 rubles + 285 rubles = 385 rubles.

Therefore, a 20-minute long-distance phone call will cost 385 rubles.

Please note that the information provided is based on the search results and may not reflect the exact pricing of long-distance phone calls in your specific location or service provider. It is always recommended to check with your service provider for accurate pricing information.