Arnold rides the subway 20 times a month to work for $2.50 a day a monthly pass cost $45.25. How much could he save by buying the pass?

He would save $4.75.

Step-by-step explanation:

Without the pass,

In a month, Arnold has to spend: $2.50 x 20 = $50

With the pass,

In a month, Arnold has to spend: $45.25

So, Arnold may save: $50 - $45.25 = $4.75 if he has a monthly pass.

4.75$

you have to multiply the daily amount by the times a month he rides it and then subtract it by 45.25