GATE Electrical Engineering (EE) 2017 Shift 1 Solved Paper

The following measurements are obtained on a single-phase load: V = 220 V ± 1%, I = 5.0 A ± 1% and W = 55 W ± 2%. If the power factor is calculated using these measurements, the worst-case error in the calculated power factor in percent is _________. (Give answer up to once decimal)