Don't go nerdy...you're driving a truck...in Alabama...a lot of your peer group isn't as smart as you. Lucky for me my wife is the accountant in the family...I'm just not good with dollars and cents. Think she spoiled me, I've just never had to apply myself to it...my accounting classes almost killed me.
Funny...I'm retired Air Force Command and Control (Aircrew/Mission Manager basically) and now a Cargo Scheduler/Load Planner Civil Service...I can figure hours and minutes, crew duty day, aircraft weight and balance, operating moments...yada-yada-yada...all in my head, but when the check comes at the restaurant, I slide it over to her...she used to get upset with me because I guess rounding up in $5 increments is wrong??
Take Care, if something else pops in my head, I'll pass it along.