Assume the zero-coupon yields on default-free securities are as summarized in the following table:

Maturity 1 year 2 years 3 years 4 years 5 years

zero-coupon yields 3.20% 3.70% 4.00% 4.20% 4.60%

Please help with the formula

Consider a four-year, default -free security with annual coupon payments and a face value of $1,000 that is issued at par. What is the coupon rate of this bond?

Question:

The par coupon rate is _______ %