I keep getting an error from this equation

= IF(A5 =< 8, B5 * .07, IF(A5 > 8 AND A5 =< 15, B5 * .05, IF(A5 > 15 AND A5 < 20, B5 * .03, 00.00)))

I'm not exactly sure why I am receiving and error. The syntax looks correct, isn't it?