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To determine the total cost for pumping concrete for a 42-foot high wall, one must consider the pricing structure for the concrete pumping service. This typically involves calculating the volume of concrete needed and applying the relevant pumping rates based on height and distance among other factors.

In this scenario, calculating the cost involves factors such as the concrete's cubic volume in relation to the height of the wall and possibly any additional costs for reaching such a height. If the pricing structure indicates an increase in rates due to the vertical height of the wall, the calculation would factor in these increased costs.

The value of $1,836.50 likely arises from a detailed computation that takes into account both the volume of concrete required and the respective rates per pump. This value indicates that the total cost has appropriately incorporated both the elevated height and any other associated costs, leading it to align with the breakdown of the cost structure provided in the pricing details.

By selecting this option, one confirms that they have accurately accounted for all factors that contribute to the final pumping cost of concrete for a 42-foot high wall.