Krizun Industries makes heavy construction equipment The standard for a particular crane calls for 21 direct labor-hours at $15 per direct labor-hour. During a recent period 1,350 cranes were made. The labor efficiency variance was $5,100 Favorable. 2 How many actual direct labor-hours were worked? O a. 28,010 direct-labor hours O b. 17,600 direct-labor hours O c. 28,690 direct-labor hours O d. 27.700 direct-labor hours O e. 27,350 direct-labor hours