The Higston Company has just purchased a piece of equipment at a cost of $500,000. This equipment will reduce operating costs by $100,000 each year for the next eight years. This equipment replaces old equipment that was sold for $10,000 cash. Ignoring income taxes, the new equipments has a pay-back period of:
A. 4.9 years.
B. 5 years.
C. 5.1 years.
D. 4.8 years.