P e r c e n t 100 p a r t i a l a m o u n t t o t a l a m o u n t x. Subtract the measured value from the actual value. The formulation is done following the given steps.
The absolute error of his speedometer is 62 mph - 60 mph 2 mph.
The formulas in Cells B1 and C1 copied to rows two to four is this. To find a percent of a number use this variant of the formula. With both values you can start solving for the percent error using the percent error formula. Convert the decimal number.