What is the Microsoft Excel FORMULA that I need to use to calculate percentage of sales?

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nicks_order_form.xlsm

Sheet1

Nick's Sporting Goods
55 Main St.
Boston, MA 02134
(217) 555-1234
Order Form
Best Selling Products Quantity Wholesale Cost Subtotal Percentage of Sales
Baseball Set 5 $24.99 $124.95
Basketball 10 $14.99 $149.90
Fishing Reel 8 $19.99 $159.92
Golf Clubs 2 $239.00 $478.00
Inline Skates 4 $49.00 $196.00
Mountain Bike 2 $249.00 $498.00
Soccer Ball 10 $9.99 $99.90
Tennis Racket 8 $29.00 $232.00
Subtotal $1,938.67
Shipping/Handling $0.00
(5% of subtotal or
if over $500, free)
Total $1,938.67