Answer:
The oven mitts cost
$13.80
But, Cook-n-Serve buys from a wholesaler, so they receive a discount of 40%
This means that they pay
(1-0.4)*($13.80) = 0.6*($13.80) = $8.28 for each pair
The markup rate on cost is 60%
And they sell for
$13.80/$8.28 = 1.67 times the price
1.67*100% = 167%
The markup rate on selling price is 167%