You estimate that a baby pig weighs about 20 pounds but the actual weight of the pig is 16 pounds what is the percent error

In my research the answer i got for this is that the percent error is 20% because all you have to do is divide 16 by 20 and see what percentage the number 16 is to 20 witch equals .8 or 80% then all you have to do is see that .2 or 20% is all that is need to make this whole thing equal 100% im sorry im not good at explaining things but im almost 99.99% sure that the percent error is 20% if it isnt please tell me and i can retry the problem i hope you have a wonderful day

The graph isn’t that clear

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8