Variance calculation dex

Hi Experts,

Need your support in calculating variance using dex. Below is how my data look like. 

Table 1 is the plan values for the whole year & table 2 is actual spent for the whole year. Maximum variance allowed is 15% of plan values. i need to display top 10 accounts whose variance is more than 15% when comparing Plan vs actual. 

for example account AC1 total plan for the year is $24k & maximum variance allowed is 15% which mean $3600. where as the total spent for the year is $32K as per table 2. So if i compare Plan VS actual my total difference is $8K (24K-32K). which is 20% of plan value.

So i need to show this in my bar chart as account AC1 variance% = 20 & amount 8K.

Regards