Help with multiple conditions and arrays

I feel like I should know how to do this, but for some reason it's not coming to me. It may be that I'm not familiar with arrays and I believe I have to use them here. I'm trying to take the sum of each regions (1,2,3,4,5,6,7,8) sales if they are greater than $50.00 and enter the sums into column F.. Really simple, I know. Any help would be greatly appreciated. Thanks in advance!