To solve this problem, we can follow these steps:
1. First, calculate the initial cost of the call without any discount by multiplying the cost per minute with the duration of the call in minutes.
2. Then, calculate the value of the discount by taking 33% of the initial cost.
3. Finally, subtract the discount amount from the initial cost to find the final charge for the call.
Let's perform these steps:
1. Initial Cost of the Call:
The rate per minute is Rs. 20, and the call lasted for 9 minutes.
Initial Cost = Rate per Minute Call Duration
Initial Cost = 20 9
Initial Cost = Rs. 180
2. Discount Amount:
The discount awarded is 33% of the initial cost.
Discount = (Discount Percentage / 100) Initial Cost
Discount = (33 / 100) 180
Discount = 0.33 * 180
Discount = Rs. 59.4
3. Final Charge for the Call:
Now, we subtract the discount from the initial cost to find the final charge.
Final Charge = Initial Cost - Discount
Final Charge = 180 - 59.4
Final Charge = Rs. 120.6
The final charge for the 9-minute call after the 33% discount on Saturday is Rs. 120.6. Therefore, the correct answer is
C. Rs.120.6.
