The following data are for Guava company's retirees health care paln for the current calendar year:

Number of employee covered 5

Years emloyed as of Jan 1 4(each)

Attribution period 20 years

EPBO Jan 1 $60,600

EPBO DEC 31 $63,600

Interest rate 6%

Funding and plan asset None

What is the interest cost to be included in the current year's Postretirement benefit expense? Explain

A. $3,600

B. $720

C. $786

D. $ 4,000