a mobile company charges a fixed amount as monthly rental which include 100mins free per month thereafter for every minute Abhay paid RS 433 for 370mins and Anitha paid RS 398for 300mins find the bill amount under the same plan if karena used it for 400mins
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Answer:
433 for 270 min (first 100 are free)
398 for 200 min
for 300 min(literally 400)
433-389 for 70min
35 for 70 min
.5 for 1 min
150 for 400 min
answer = 150
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