Lincoln, Inc., which uses a volume-based cost system, produces cat condos that sell for $140 each. Direct materials cost $18 per unit, and direct labor costs $10 per unit. Manufacturing overhead is applied at a rate of 230% of direct labor cost. Nonmanufacturing costs are $34 per unit. What is the gross profit margin for the cat condos? (Round your intermediate calculations to nearest whole dollar.)

a. 39.3%

b. 63.6%

c. 43.2%

d. 60.7%