Market interest rates are $($nominal$)3\mathrm{.}0\%.$ You just bought a bond, par $$10$K$,5$y maturity, coupon $3\mathrm{.}5\%.$

The moment after you bought it$,$ the Fed raised rates, and the market responded. Market interest rates instantly went to $($nominal$)4\mathrm{.}0\%.$

Bummer. When interest rates go up$,$ bond prices go down.

How much value did your bond lose? $($Compute the price you paid, and what it's worth after the rate change, and that's your loss. Report a $$100$ loss as $"100"$