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: $1000 in 30 days from today,$2000 in 60 days from today,and a final payment of $1026.51 in 80 days from today.What simple interest rate,r,was used?

A) r < 4%
B) 4% < r < 4.5%
C) 4.5% < r < 5.0%
D) 5.0% < r