What is the daily interest on $10,000 over 15 years at 5% interest rate.

Assuming it is not compound interest (Since if it was, the daily gain would change on a yearly basis):

1 year of interest = 10,000 * 5%

= 10,000 * ¹/₂₀

= ^10,000/₂₀

= 500

 

1 day of interest = ⁵⁰⁰/₃₆₅

= $1.37