Calculate Banding based on 2 variables

Hi,
I need to calculate bands based on the below table, I need a value to be populated in column I based on the forecast hours/ productivity. Can anyone help with this?

So for example if the data in G3 = 52 & H3 = 105 then the output would be 1.5

Thanks
Johnny

Hours Sold Productivity
50-99.9 0.5 1 1.5 2
100-124.9 1.5 2 2.5 3
125-139.9 2.5 3 3.5 4
140> 3.5 4 4.5 5

Richard,
The numbers in B16:F19 are a matrix which gives output dependent on the values in columns G & H, For example if column G value was 56 and column H value was 67 then the result would be 0.5. I have just noticed that I dont have the productivity figures in the matrix box B16:F19, I have attached a new modified copy for your review which is hopefully a bit clearer with a highlighted result column.

Please see attached example