Most online ads typically charge by the click. An advertiser's total fee, $d$, in dollars, is given by the equation $d=\dfrac{c+20}{4}$, where $c$ is the number of times the advertisement has been clicked. By how much does the total fee increase for each click of the advertisement?

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If we break apart the fraction, we can seperate the equation into the rate and constant portions.

$$d=\frac{c+20}{4}$$ $$d=\frac{c}{4}+5$$

The slope, or rate, given by click per dollar, is $\dfrac{1}{4}$. This translates to $\boxed{\$0.25}$ per click.

We can choose an arbitrary situation. For example, compare the price of 1 click versus 2 clicks.

Finding the difference:

$$\frac{22}{4} -\frac{21}{4}$$ $$= \frac{1}{4}$$ $$=\boxed{\$0.25}$$