How much will it cost the company to call in 1,000 of these bonds? Is it worth pursuing this strategy if your interest rate on a loan is 13%?

Assume that the firm has to pay 10% more than the market price to buy back the bonds (that is "call in the bonds"). For example, if the $1,000 bond was priced $850 then a 10% premium would mean the firm would have to pay $935 to buy back the bonds. Do not assume that the price of the $1,000 is $850 which is just for illustration, you have to calculate the price.