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The government has changed and the rates are revised. The fixed rental is raised to Rs 400 for every two months; but the number of free minutes is increased to 300. The slabs of charge remain the same. What would be the increase or decrease in telephone bill for a user who is talking for 1600 minutes?


Options:
A .   Rs 50
B .   Rs 60
C .   Rs 70
D .   Rs 80
E .   Rs 90
Answer: Option A
:
A

as;When number of minutes =1600

Old scheme:-

Rental = 330. bill = 1325*0.8 + 330= Rs 1390

New scheme:-

Rental= 400. bill=1300*0.8 + 400 = Rs 1440. Increase = Rs 50. Answer is option (a)



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