how to solve following equation via texas instruments BAII plus professional calculator?

"Let C be the coupon rate at which the price for the 4-year T-Note equals the par value. Using the spot rates from the table to discount cash flows, we can write:

Unfortunately, the calculator doesn’t have a worksheet set up for this type of problem. You can use the TVM worksheet to get the PV factors of the individual cash flows and store them in memory registers 1 to 4, just to save you from doing the arithmetic by hand.

I get P_{1}=0.98039 P_{2}= 0.95181, P_{3} = 0.92049, and P_{4} = 0.88849 and plug in to the following formula:

C = (1 - P_{4})/ (sum of P_{1} to P_{4}) = (1 - 0.88849) / 3.74119 = 0.02981