Judah wants to buy a card for his mum
The price he calculated was $4.50
The actual price is $4
Percentage error = real value - actual value / actual value x 100%
Real value = $4.50
Actual value = $4.0
Percentage error = 4.50 - 4.0 / 4 x100%
Percentage error = 0.5 / 4 x 100%
= 0.125 x 100%
= 12.5%
The percentage error is 12.5%