If representing the number as text is acceptable, the following will solve your problem:
=IF($E$13>200,ROUND($E$13,0),IF(ROUND($E$13,0)=ROUND($E$13,1),CONCATENATE(ROUND($E$13,0),".0"),ROUND($E$13,1)))
If you need to use your number in future calculations, be sure to use the original number, which can be obtained via ROUND($E$13,1)
.