A store sells lightbulbs in different quantities. The given figure shows the relation between cost and quantity. According to the figure, what is the cost of a single lightbulb?

$ 0.56

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$ 1.80

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$ 2.50

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$ 3.60

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Solution

The correct option is B $$ 1.80$
Consider the first point shown in the graph $(5, 9)$ .
It shows that $5$ bulbs cost 9$.
Since the relationship is linear, cost of $1$ bulb will be $\frac{9}{5} =$ 1.8 $

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