John is trying to decide how to divide his time between his job as a stocker in the local grocery store, which pays $7 p

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John is trying to decide how to divide his time between his jobas a stocker in the local grocery store, which pays $7 per hour foras many hours as he chooses to work, and cleaning windows for thebusinesses downtown. He makes $2 for every window he cleans. Johnis indifferent between the two tasks, and the number of windows hecan clean depends on how many hours he spends cleaning in a day, asshown in the table below:
If we plot John's opportunity cost per window on the verticalaxis and the number of windows cleaned each day on the horizontalaxis, we will have John's ______ curve for window-cleaningservices.