Portfolio A consists of a one-year zero-coupon bond with a face value of R 2,000 and a 10-year zero-coupon bond with a face value of R 6,000. Portfolio B consists of a 5.95-year zero-coupon bond with a face value of R 5,000. The value of Portfolio A is R 4,016.95 and the value of Portfolio B is R 2,757.81. The current yield on all bonds is 10% per annum. The values of Portfolio A and Portfolio B with a 6% increase in the yield are R 2,915.67 and R 1,929.84 respectively. Calculate the percentage reduction in the values of Portfolio A and Portfolio B when the yield increases by 6% per annum.