Answer: $11.50
Explanation: As we know that :-
Total standard cost for one unit = standard material cost + standard direct labor cost + standard overhead cost
where,
standard material cost = (40 grams) * ($0.10) = $4
standard direct labor cost = (0.25 hrs) * ($12) = $3
standard overhead cost = (0.25 hrs) * ($18) = $4.5
therefore :-
Total standard cost for one unit = $4 + $3 + $4.5 = $11.5