Unable to delete default inputmask percentage value

Unable to delete default inputmask percentage value

Hello Team,
 
I am using inputmask plugin to allow  user to enter percentage value with default % as the placeholder
However when i am trying to delete default 0.00 it is not allowing me to delete.

Could you please tell how to allow user to delete this 0.00 value by using backspace or delete key.
Please find source
Demo Code