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?___

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Solution

When number of minutes =1600

Old scheme:-

Rental = 330, bill = 1325 $\times$ 0.8 + 330= Rs 1390

New scheme:-

Rental= 400, bill=1300 $\times$ 0.8 + 400 = Rs 1440. Increase = Rs 50.

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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.

When number of minutes =1600

Old scheme:-

Rental = 330, bill = 1325 $\times$ 0.8 + 330= Rs 1390

New scheme:-

Rental= 400, bill=1300 $\times$ 0.8 + 400 = Rs 1440. Increase = Rs 50.