A website sells sweaters. The amount of sales P(c) varies directly with the number of customers c. Ten customers bought a total of $455 worth of sweaters.
Which equation can used to find the sales for c customers?
A. P(c) = 45.5c
B. P(c) = 455c
C. P(c) = 4550/c
D. P(c) = 455/c