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Problem $15-3$A $($Algo$)$ Debt investments in available$-$for$-$sale securities; unrealized and realized gains and

losses LO P$3$

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Stoll Company's long$-$term available$-$for$-$sale portfolio at the start of this year consists of the following.

Stoll enters into the following transactions involving its available$-$for$-$sale debt securities this year.

January $29$ Sold one$-$half of the Company B notes for $$78,000.$

July $6$ Purchased Company $x$ bonds for $$123,600.$

November $13$ Purchased Company $Z$ notes for $$267,900.$

December $9$ Sold all of the Company A bonds for $$518,300.$

Fair values at December $31$ are B$,$ $$84,300$; C$,$ $$604,800$; X$,$ $$100,000$; and Z$,$ $$288,000.$

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Determine the amount Stoll reports on its December $31$ balance sheet for its long$-$term investments in available$-$for$-$sale

securities$.$