Answer:
$78
Step-by-step explanation:
From the question, we are told that 4 books cost $52, this can be expressed as;
4 books = $52
To determine the cost of 6 books, this can be written as;
6 books = x
Divide both expressions
4/6 = 52/x
Cross multiply
4x = 6 * 52
4x = 312
x = 312/4
x = 78
Therefore 6 books will cos $78