Unless otherwise stated, round the final answer to $2$ decimal places.A jewelry stores sales and expenses are given below for the months of October, November and December: October November DecemberSales $$40,000$ $$59,000$ $$109,000$Expenses $($all$)$ $$38,000$ $$50,000$ $$84,000$a$.$ Find the profits for each.b$.$ Find the percent net margin for each.Net profit Margin formula is $=$ Profit $-$: Sales