Currently, the best bid in the LOB is $9.33 with a bid size of 2, the
next best bid is $9.32 with a bid size 1, the best ask is $9.37 with
a bid size 3, and the next best ask is $9.37 with a bid size 1. What
is the quoted spread as a percentage of the current price? Keep 3
decimal places. For example, if the answer is 2.4567%, enter
'2.457'.