Very good job! They are all correct and it shows how you got the answer! ^_^ 100%
First you want to add a decimal after the first one to make it 1.41. Now you want to count the amount of places after the 1. It would be 8 places for 141000000 in scientific notation is 1.41 x

.
I'm pretty sure (not fully) that the percentage would be 250%