How to merge two rows and get result?

Table Data:

sales_products table data:

product_id	quantity	sales price
1	4	300
1	5	300
2	3	400
2	2	400
3	3	100

products table

id	product_name
1	product_x
2	product_y
3	product_z

Expected Query Output

product_name	Quantity	Total_Price
product_x	9	2700
product_y	5	2000
product_z	3	300

I was trying with following Query and didn't get expected output

$invoiceDetails = DB::table('products')
    ->join('sales_products', 'sales_products.product_id', '=', 'products.id')
    ->select(
        'products.product_name',
        'sales_products.quantity',
        'sales_products.sales_price',
        DB::raw('(sales_products.quantity * sales_products.sales_price) as total')
    )
    ->where('sales_products.invoice_id', '=', $id)
    ->get();

via Chebli Mohamed