Please provide a brief explain on how did you do the calculations. Thanks!

Use the following data to answer the questions about Manufacturing Firm GFE:

Retailers' Sales Revenue from GFE's widgets	$3,000,000
Manufacturer (GFE's) Gross Sales Revenue	$1,800,000
Trade Promotion (10% off)	$180,000
GFE's Net Sales Revenue	$1,620,000
GFE's Cost of Goods Sold (all Variable)	$540,000
GFE's Advertising Expenditure	$50,000
GFE's Sales & Marketing Administration Expenditure	$150,000
GFE's Consumer Promotion Expenditure	$70,000
GFE's Corporate Executive Salary	$70,000
GFE's Research & Development costs	$20,000
GFE's Net Profit before taxes	$720,000
Total Widget Industry Sales at retail	$30,000,000
Manufacturer's (GFE's) Suggested Retail Price/unit	$10.00
GFE's List Price to Retailer	$6.00
Number of Widgets Sold by GFE to retailers	300,000
GFE's ($) Market share	10%

PART 1: GFE is a manufacturer of widgets. They sell their widgets directly to multiple retailers who sell them to end-users (people like you and me).

1. What is the total Marketing and Sales Expense for GFE?
2. What is the current Net Marketing Contribution (NMC) for GFE?
3. What is the current Gross Profit Margin for GFE?
4. What is the current Marketing Return on Sales (ROS) for GFE?
5. What is the current Marketing Return on Investment (ROI) for GFE?
6. What is the Retail Margin?
7. What is the Retail markup percentage?