A hardware store sells lightbulbs in different quantities. The figure above shows the cost of various quantities. 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 $F r o m t h e g r a p h w e c a n s e e t h a t c o s t o f$ 5 $l i g h t b u l b s i s$ $9$ .
Hence, cost of $1$ lightbulb $= \frac{9}{5} =$ 1.80$.

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