a) There are 3000 pairs of sunglasses and each was bought at $1.25

Total cost is:

`TC =3000*$1.25 =$3750.00`

**Thus the total cost is $3750**

b) The average markup is 36%, from the total cost and is the difference between the total selling price and the total cost.

`TM =...

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a) There are 3000 pairs of sunglasses and each was bought at $1.25

Total cost is:

`TC =3000*$1.25 =$3750.00`

**Thus the total cost is $3750**

b) The average markup is 36%, from the total cost and is the difference between the total selling price and the total cost.

`TM = TS -TC `

`TS = TM+TC =36%*TC +TC =0.36*TC+TC =1.36*TC `

`TS =1.36*$3750.00 =$5100.00`

**Hence the total sales are $5100**

c)

On the "bargain table" there will be 20% of 3000 pairs of glasses. It means

`20%*3000 =0.2*3000 =600` pairs of glasses

From these 600 pairs 30% will be thrown away as being damaged.

`30%*600 =0.3*600 =180` pairs thrown.

The remaining pairs will be sold with $1.00 The selling price for these will be

`S =(600-180)*$1 =$420.00`

The total number of glasses to be sold at initial price is

`3000-600 =2400` pairs of glasses

The total price to sell the initial 2400 pairs of glasses is

`Si= TS-S =$5100.00-$420.00 =$4680.00`

The initial price for one pair is

`P =($4680.00)/2400 =$1.95`

**They need to start selling the sunglasses at $1.95 per pair**