A bill of Rs 199/Month is definitely not possible when you make only

To get a total bill of Rs. 199, we need to somehow amount the outgoing calls to Rs. 100, as the plan price is Rs. 99

In Option A, 30 STD calls to Airtel (500 km+) will amount Rs. 30*1.5= Rs. 45

55 Local calls to Airtel/ GSM will cost Rs. 55*1= Rs. 55

So, total amount for the given option= Rs. 55+ Rs. 45= Rs. 100. This will amount to total bill of Rs. 199

In option B, 16 STD Airtel calls will amount to Rs. 16*1.5= Rs. 24

76 local calls will cost Rs. 76*1= Rs. 76

So, total amount for the given option= Rs. 76+ Rs. 24= Rs. 100. This will amount to total bill of Rs. 199

In option C, 10 STD calls (250 km) to Airtel, GSM and Landline will cost Rs. {(10*1.5) + (10*2.5) + (10*2.5)}= Rs. (15+25+25)= Rs. 65

The bill from local calls can vary from Rs. 30*1 to Rs. 30*2 i.e from Rs. 30 to Rs. 60

So, total amount can vary from Rs. 95 to Rs. 125. So, a bill of Rs. 100 is possible, which can amount to a total bill of Rs. 199

In option D, 8 STD calls on Airtel, 4 GSM STD and 7 Landline STD, all 500 km+ will cost Rs. {(8*1.5) + (4*3) + (7*3.5)} = Rs. (12+12+24.5)

= Rs. 48.5

Local call bill will vary from Rs. 55*1 to Rs. 55*2, which is from Rs. 55 to Rs. 110.

So, total amount can vary from Rs. 103.5 to Rs. 158.5. So, a bill of Rs. 100 is not possible. Therefore which a total bill of Rs. 199 is not possible in this case.