Hexagon Inc. manufactures fruit juice. Hexagon had an unfavorable material price variance of $225. The actual quantity of raw material used was 900 kilograms and the standard price of raw material was $4 per kilograms. Calculate the actual price per kilogram of raw material.

a. $3.75 per kilogram

b. $4.00 per kilogram

c. $3.00 per kilogram

d. $4.25 per kilogram