Fatal Inc.manufactures parachutes.Fixed and variable manufacturing cost pools are allocated to each parachute using budgeted assembly hours.Budgeted assembly time is 4 hours per unit.The following table presents the amounts for July. 
Required:
a.Calculate the efficiency variance for variable overhead costs.
b.Calculate the rate variance for variable overhead costs.
c.Calculate the rate variance for fixed overhead costs.
d.Calculate the production-volume variance for fixed overhead costs.
Definitions:
Prenatal Care
Medical and healthcare services provided to a woman during pregnancy to ensure the health of both the mother and the fetus.
Menstrual Period
The monthly shedding of the uterine lining in people with a uterus, marked by bleeding through the vagina.
Postcoital Contraception
Birth control methods used after sexual intercourse to prevent pregnancy, often referred to as the "morning-after" pill.
Norplant
A form of contraceptive implant that releases hormones to prevent pregnancy over an extended period.
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