Math in Storyline (BEDMAS)

Hi there, 

Trying something new in Storyline and conceptually it sounds easy but I'm having difficult wrapping my head around how to accomplish it. 

Here's the situation:

Our organization has defined some criteria for achieving a competency and there are tasks to complete. For example,

• Being a super users earns you 2 points for every hour spent as a super user.
• Self-directed learning earns you 2 points for every 100 pages read. 
• Completing an examination earns you 25 points per every exam complete.

I'm envisioning a setup where the user can enter the amount of time, pages read,  and number of exams complete and have storyline do the math. For example, 25 points * 2 exams complete = 50 points; 2 points * 2 hours spent as a super user = 4 points; and now cumulatively the person has 54 points.

I've played around with the variables only I'd like this to be a bit more user friendly. I wouldn't want each calculation to have a designated calculate button.