$45 is the total consumer surplus for these three.
When customers pay less for a good or service than they are willing to, this is known as a consumer surplus. It measures the extra benefit that consumers get from paying less for something than they would have been prepared to.
Consumer surplus and producer surplus together make up the total social surplus. It serves as a gauge of customer utility satisfaction.
The region below the demand curve, which depicts the consumer's willingness to pay for a good at various prices, and above the price line can be used to show it graphically.
Depending on how much the consumer values the product, it shows the profit from the transaction. It is advantageous when the consumer's willingness to pay exceeds the product's actual price.
In the event of an inelastic demand curve, consumer surplus is unlimited; in the case of an elastic demand curve, it is zero.
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