One app I use on my phone more than any other is the calculator app.
I like to make crude statistical observations using my calculator.
Have you ever wondered how much salary you would earn if you continuously received 5 pence every minute? I did the math.
There is 1440 minutes in a day so every day you would make £72 or $72 if you were getting five cents. There is 365 days in a year so you would receive £26,280 annually before tax.
There are 12 months so if you divide £26,280 by 12, you get.. £2,190 every month. At the time of writing this blog entry, a salary of £2190 per month is more than the income of most people on my Island, even before tax. As a second income, that is outstanding.
All that is left is to think of things that generate 5 pence every minute all day without your intervention.
Perhaps a website or commission from a media product you have made or something like that.