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a) In the postpaid tariff plan of a mobile company, they charge Rs. 100 as monthly rental and 30paise per minute for calls. Write down an algebraic expression to represent the cost of the bill, if m represents the number of minutes spent on the calls.

b) Find the cost of the bill for a talk-time of one hour.

 

Asked by Topperlearning User 21st July 2014, 1:37 PM
Answered by Expert
Answer:

In the tariff plan, monthly rental is Rs. 100, which is constant, and the rate of calls changes per minute.

 

a) For m being the number of minutes spent on calls, the algebraic expression is 100 + 30m

 

b) One hour = 60mins

 

Cost of bill = 100 + 30(60)= Rs.100 + Rs.180 = Rs.280

 

Answered by Expert 21st July 2014, 3:37 PM
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