Qty on hand: 15,000 bananas
Average price: $3.44 for one banana
Last price: $2.81 for one banana
(meaning the bananas you purchased, now got cheaper in the market already)

Cost $: $51,600 (that's the total you spent to buy all 15,000 bananas at $3.44 per banana
Market $: $42,150 (that's how much all your bananas are worth in the market now)

Unrealized P/L $: -$9,450 (unrealized profit/loss means the number tells you how much you profit or lose IF you sell all your bananas now, at this moment if you sell all your bananas you rugi $9,450 because the bananas are cheaper than when you purchased them)

Unrealized P/L %: -18.31% (same like above, but calculated in % instead of $. meaning you rugi 18.31% if you sell all your bananas at market price now)