The equation of the calibration curve is A=0.026C (ppm P). The absorbance for your original unknown sample was 0.257. A 25.00 mL aliquot sample of the unknown is spiked with 100 L (0.100 mL) of the stock P solution with a concentration of 1,963.7 ppm P. Assume the total volume remains constant. The absorbance is measured again to be 0.395. Calculate the % Spike recovery to 2 decimal places.