Maria bought $4$ black and a certain number of red and blue pencils at $15$ cents each and carried them home in one

Maria bought $4$ black and a certain number of red and blue pencils at $15$ cents each and carried them home in one bag. After Maria came home, she took out one pencil at random to write a note and then put the pencil back into the bag. Sometime later, she needed to write another note and again took out a pencil from the bag. If the probability that Maria wrote both her notes in black is $\dfrac1{36},$ how much did she spend on all pencils?

A. $\$3$
B. $\$3.2$
C. $\$3.4$
D. $\$3.6$
E. $\$3.8$

Answer: D

Source: Manhattan GMAT

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