Woocommerce - Save and display product previous sales prices

Question

In our country,under the new law, the display of discounted product prices will change. We have to display: Regular Price Sales Price Lowest sales price in the last 30 days. And the % discount should be calculated with a new logic. e.g. if in the last 30 days there was a 20% discount from the regular price, and later we give a 25% percent, the appeared % discount wouldnt be 25%, that would be only 5% (because this is the difference between new and past sales prices) Could you give me an idea how could we do this?