fix: bill calc

src/modules/bills/bills.service.ts

@@ -50,11 +50,11 @@ export class BillsService {
 
       for (const value of values) {
         const waterCost = new Decimal(waterRate).mul(value.waterUsage);
-        const sewageCost = waterCost.mul(waterCost);
-        const subtotal = waterCost.add(sewageCost);
+        const sewageCost = waterCost.mul(0.3);
+        const subtotal = waterCost.plus(sewageCost);
 
         const tax = subtotal.mul(0.1);
-        const totalPrice = subtotal.add(tax);
+        const totalPrice = subtotal.plus(tax);
         const company = companyMap.get(value.companyId);
         if (!company) {
           throw new BadRequestException(CompanyMessage.COMPANY_NOT_FOUND);
@@ -73,7 +73,7 @@ export class BillsService {
         const invoiceItem = em.create(InvoiceItem, {
           name: "قبض آب",
           count: value.waterUsage,
-          unitPrice: new Decimal(waterRate),
+          unitPrice: totalPrice,
           discount: new Decimal(0),
           totalPrice,
           invoice,
@@ -167,15 +167,14 @@ export class BillsService {
 
       for (const company of companies) {
         const subtotal = new Decimal(chargeRate).mul(company.metrage);
-        const tax = subtotal.mul(0.1);
-        const totalPrice = subtotal.add(tax);
+        const totalPrice = subtotal;
 
         const invoice = em.create(Invoice, {
           company,
           totalPrice,
           originalPrice: totalPrice,
           dueDate,
-          tax,
+          tax: new Decimal(0),
           business,
           bill,
         });