Using the Merchant's Rule,a Debt of $4000 Is Paid Off

Multiple Choice

Using the Merchant's rule,a debt of $4000 is paid off as follows: $2000 in 50 days and a final payment of $2026.51 in 80 days from today.What simple interest rate,r,was used?

A) r < 3.0%
B) 3.0% < r < 3.5%
C) 3.5% < r < 4.0%
D) r > 4.0%