Grouper plc purchased a machine at a price of 109,800 by signing a note payable, which requires a single payment of 138,933 in 6 years. Assuming annual compounding of interest, what rate of interest is being paid on the loan? (Round factor values to 5 decimal places, e.g. 1.25124 and final answer to 0 decimal places, e.g. 13%.) Rate of interest %