Sofia purchased 5 black pencils along with a certain quantity of red and green pencils, each costing 20 cents, and carried them in a single bag. Once she arrived home, she randomly selected one pencil to jot down a message and then returned it to the bag. Later, she needed to write another message and again picked a pencil from the bag. If the probability that both messages were written with black pencils is 1/25, what was the total amount she spent on all the pencils?