Improve transaction investment

apps/api/src/app/portfolio/portfolio-calculator.ts

@@ -1027,8 +1027,11 @@ export class PortfolioCalculator {
         valueAtStartDate = valueOfInvestmentBeforeTransaction;
       }
 
-      const transactionInvestment = order.quantity
+      const transactionInvestment =
-        .mul(order.unitPrice)
+        order.type === 'BUY'
+          ? order.quantity.mul(order.unitPrice).mul(this.getFactor(order.type))
+          : order.quantity
+              .mul(totalInvestment.div(totalUnits))
               .mul(this.getFactor(order.type));
 
       totalInvestment = totalInvestment.plus(transactionInvestment);