How do I edit the total price field in the pdf invoice?

Hello

Right on the invoice where it says total price per item I see this: <span class=”woocommerce-Price-amount amount”><span class=”woocommerce-Price-currencySymbol”>$</span>230.00</span>

But how can I multiply that value times 0.45. I’m using an app that sends the discounted value to woocommerce through api so my value is wrong on the invoice. How can I multiply that value times 0.45 so the discounted price shows instead of the full price?