A busy toll highway that has four toll collectors for northbound traffic is an example of a single-channel, single-phase system

What is a common-size statement? Why are these statements useful?

What will be an ideal response

Calculate the sales effect in period 15 if the advertising expense for that period is $30 million

A) $45 million B) $450 million C) $2 million D) $30 million E) $540 million