Discount Airlines is preparing a contribution margin report segmented by route. The following information is available:

Line Item DescriptionAtlanta$/$

New YorkMiami$/$LANew York$/$

ChicagoAverage ticket price per passenger$$900$$$1,240$$$750$Total passengers served$8,8007,00012,200$Total miles flown$176,000195,00097,600$

The variable costs per unit are as follows:

Line Item DescriptionVariable Costs Per UnitFood$/$beverage service$$7$ per passengerSelling$$90$ per passengerFuel$$15$ per mileWages$$20$ per mile

What is the contribution margin ratio for the Miami$/$LA route $($rounded to one decimal place$)?$

a$.13\mathrm{.}5\%$

b$.45\mathrm{.}2\%$

c$.71\mathrm{.}6\%$

d$.21\mathrm{.}4\%$