My average in AP world history is a 90, The weight on the class is 1.10%
with the weight, whats my average?
Your average is still 90. The 1.10 (not 1.10%) only matters when weighed in combination with other grades. And even then it might not make a difference.
For example, if your other grades are 80 and 100 (with weight 1.00 each), then the average of the three is still 90, regardless of its weight. I'm sure you will see why.