The correct answer is D.

At 31 March 2015 (one year after the initial sale), the deferred consideration of $12,650 would need to be discounted by 10% for one year to $11,500 (effectively deferring a finance cost of $1,150).

The total amount credited to profit or loss would be $24,150 (12,650 + 11,500 or 25,300 - 1,150).

Over half of candidates arrived at A as their (incorrect) answer which discounted the finance for two years (but only one year remained at 31 March 2015).

The other possible explanation of this error is that this figure of £23,105 is the sales revenue to be reported, but the question asked for the total amount  credited to profit and loss (which must include the interest receivable for one year).

Distracters B and C discount the whole of the proceeds (rather than half) for one year and two years respectively.