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The price I pay for one unit of electricity is set for each month on the first day of that month. The charts below show the number of units of electricity used each month and the price per unit of electricity paid each month.

The total bill I pay for electricity is from multiplying the electricity units with the price per unit of each month.

 

Which one of the following graphs, if suitably labelled, could represent the amount of money I paid for electricity during those months?