Week 02 Tutorial 5

[Pranjal Sarkar]

Hi,

I could not understand the working of question 5.

According to my logic,

Mary effectively have 300 mins to pay the call company. (After 400 free minutes have been cut off from the 700 mins)

Now, 1 month means 43200 mins. So, Mary has used the call service for less than a month.

Now, 

      1 month(43200 mins)  -->   Rs. 50

      1 min                               -->   Rs.  50/43200

      300 min                          -->   Rs.   (50/43200) * 300   ........   

The calculation comes out to be Rs. 0.34.

Here, the additional charges do not come in, i.e., the 20 paise.

Here, what am I missing?

Waiting for an early reply.

Thanks