A 60-day, 12% note for $10,000, dated May 1, is received from a customer on account. If the note is discounted on June 10 at 15%, the proceeds are:
a. $10,115
b. $10,200
c. $10,000
d. $10,030

I don't know how any of these could be correct. How do you determine the answer? Do you use 12% or 15% or count days?

Textbook does not have an example like this.

Need help quickly!