The two violists are tuning their A-strings, for which the basic frequency is 440 Hz if properly tuned. If both play the A-note, 9.4 beats per second are heard. Determine by what fractional amount should the player of the viola having the lower frequency raise the tension in his string to make its frequency similar to that of the other viola? Suppose that the other viola is already correctly tuned. Deduce your answer in percent (%).