We cannot write a mathematical equation for the two conditions, however a computer program can wok out the condition and given the right output
The main reason why a single mathematical equation cannot work in this case is because the cost is not fixed, and the number of books also changes, hence two variable value.
In this type of condition a computer program will work best by setting a condition based on the number of books to be purchase, of 6 the price should be $3.60 and if 10 the price should be $5.5
Learn more about equations here:
https://brainly.com/question/2972832
